Nearly everybody who has indoor plants will sooner or later make the dubious acquaintance of fungus gnats. Not only but especially in winter, those tiny black insects whirl up from the soil when we water our plants and fly around seemingly aimlessly. Unfortunately, fungus gnats are not only an annoying or aesthetic problem but a real threat to our seedlings because they like to nibble on plant roots! If we only had two or three gnats taking a small bite out of the roots, that wouldn’t be a problem. However, as it happens, fungus gnats never work alone but rather in clouds of gazillions. You can imagine the havoc these numbers can wreak among our baby vegetables. In order to find out how to get rid of fungus gnats, we first must look at what they are exactly.
What are fungus gnats?
Fungus gnats can be found all over the world. In Europe, there are around 600 different types. They are related to midges but cannot sting. In nature, especially in woods or moors, but also in gardens, their larvae play an important role as they decompose organic material.
Fungus gnats are often introduced with potting soil that already contains eggs or larvae, but they can also get into the house through open windows.
You have an infestation when swarms of 2 – 4 mm small black insects rise from the pots every time you move or water them. Contrary to fruit flies, fungus gnats have long legs and feelers as well as large wings. They preferably lay their eggs in the moist soil of indoor plants, and one female can lay up to 200 eggs, out of which wormlike, about 5 – 7 mm long white larvae hatch. They live in large groups in the moist soil. After about 13 days, the larvae pupate, and five to six days later, the fungus gnats hatch.
What damages do fungus gnats cause?
While the black fungus gnats are only pesky, their larvae, which live in the soil, eat not only dead plant parts but also the plants’ roots. Large plants can usually cope with that, but seedlings and cuttings can die. The damaged roots can’t take up enough water and nutrients, and bacterial and fungal diseases can penetrate into the plant through the open roots.
How to get rid of fungus gnats
Now, the good news is that there are ways to get rid of those little black beasts – and without throwing a chemical bomb into your living room. Read on!
Prevention
Prevention, they say, is better than cure. So the best way to get rid of fungus gnats is to not let them in in the first place.
Soil preparation
Since we mostly bring fungus gnats in ourselves with the soil we use for potting or seed starting, it’s certainly a great idea to give that a closer look. Only buy high-quality potting soil in undamaged sacks. If you use your own potting preparation, for example with compost, sterilise it before use. For that purpose, heat the soil in the oven at 150 °C (300 °F) for 30 minutes and let it cool down.
Watering correctly
As fungus gnats need moist soil to survive, we should only water our plants when the surface is really dry. However, this can be a bit tricky with seedlings as they must not dry out. It’s better to water several times a week with little water instead of once with a lot. Reliable water monitoring is essential when it comes to healthy seedlings and getting rid of fungus gnats.
Traps
There are those yellow sticky traps that you can put into the planting pots. They attract (amongst others) fungus gnats, which will stick to the gluey cards. However, those traps only catch the male gnats, and although males and females are necessary for producing fertilised eggs, sticky traps are not enough to get rid of all the gnats in your home. The traps are an indicator of an infestation and also a good addition to the next steps:
Natural antagonists
Nematodes
There is a kind of secret weapon, like a SWAT team, in the battle against fungus gnats: nematodes (Steinernema feltiae or SF-nematodes). They are minuscule, wormlike animals that live in the soil and kill fungus gnats’ larvae. Sounds disgusting, but it works wonderfully and is a great non-chemical way of getting rid of our plants’ unwanted roommates.
You can buy nematodes online. They come in small packages and look like a powder that you have to dilute with water. I always use a large mason jar for that, and then add the dilution to the watering can, where I fill it up with more water.
Before you spread the nematodes, however, the potting soil must already be moist. Nematodes (like fungus gnats) die in dry soil, so water your plants in advance, then bring out the nematodes and keep the soil moist during the next weeks. It usually takes about 2 – 4 weeks to notice a considerable decline in fungus gnats.
Predatory mites
Like nematodes, predatory mites also find fungus gnats irresistible. You can use the types Hypoaspis miles, Hypoaspis aculeifer Macrocheles robustulus. They usually come as a granulate that you spread on top of the soil.
Bacteria
Special bacteria, like Bacillus thuringiensis subsp. Israelensis are also a good weapon against fungus gnats. Like nematodes, they are diluted in water and poured on the potting soil with a watering can.
Neem oil
Neem oil affects insects’ hormonal system and prevents them from forming chitin, so that they will not reach the stage of mature gnats and, as a consequence, are not able to reproduce. If you are sure that there are no beneficial insects in the vicinity that you want to spare, neem oil is a good way to get rid of fungus gnats. I wouldn’t use it outside, though, for fear of affecting bees and other pollinators.
Soil cover
A well-known home remedy to prevent the gnats from laying their eggs in the soil is to cover it with quartz sand, where the flies will not get through it. However, the layer should be about 1 cm (0.5 inches) thick. Sprinkle a bit of baking soda on top of the sand to set a double barrier.
Tempting as it might be, however, do not cover your potting soil with organic material as that provides nourishment for the gants and larvae.
However tedious, fungus gnats are not one of the seven plagues, and as easily as we can bring them in unconsciously, we can get rid of them. It’s best, of course, to take precautions, but as you have seen above, there are also several non-chemical ways to protect our green friends from those root nibblers.
When I was a child, we had a vegetable garden of about 40 square meters. Seeing that we were six people and Granny also had a patch for her and Gramps, it was a relatively small garden. Yet, it produced most of our vegetables, and we rarely had to buy any from the supermarket. Today, my mom is still an avid gardener, but she cultivates only two raised beds for her and my dad, which is plenty of work for an octogenarian. Surprisingly enough, like before, those beds (and a few pots) provide them with most of their veggies throughout the growing season. That shows that a small space is no excuse for not starting a vegetable garden! Let me show you how you can also have a huge harvest in your small space vegetable garden.
Small vegetable gardens: Choose your site
If you have already established patches or raised beds to grow vegetables, that’s fine. But if you’re just starting, there are a few things to observe.
Location
Vegetables need light to grow. It doesn’t matter if you have a small garden with a tiny bed or just some pots on a patio, as long as your veggies get enough sunshine, they’ll be fine.
Inventory
Take inventory of what plants already grow in your garden and use the different growing heights to your advantage. If you have some shrubs and bushes, for example, you could plant herbs which grow smaller, on the south of them and proceed with vegetables. That way, you can cultivate fruits, herbs and vegetables in a comparatively small space.
Patches and Co.
If you have the opportunity you can create some garden patcheswith this easy method (no need to dig, I promise!). But even if a coherent gardening space isn’t possible, maybe you can create “pockets” within your garden, which means single patches scattered throughout your soon-to-be small vegetable garden.
Raised beds may be a good idea, no matter if you have a garden, patio or just a balcony.
Last but not least, pots and containers fit on the tiniest balcony. You’ll be surprised to see what you can grow in pots!
Dreaming your small vegetable garden
Every garden, even a small one, needs a plan! I know it can be tedious to create one, but I promise you it’s worth it.
Choosing vegetables
To make a plan, however, you must decide first what vegetables you want to grow. Make a list with all the veggies you like AND which don’t require too much space.
Good, and beginner-friendly, examples are Swiss chard, Chinese cabbage, peas, beans, leeks, carrots, garlic, onions, kohlrabi, radishes, turnips, beetroot, stalk celery, lettuce and lamb’s lettuce.
For a small vegetable garden, it’s also clever to choose vegetables that grow vertically rather than horizontally. Runner beans, for example, that grow upwards on trellises, may be a better option than bush beans, which require much more space.
If you have one or two vegetables that you absolutely want to have, although they normally need too much space, include them in your plan. Growing our own food should be fun, and not a way to limit ourselves. Growing them in pots is usually a great option.
Look for high-yielding vegetables that produce a huge harvest. Good examples are zucchini, carrots, onions and tomatoes.
Make sure you cultivate varieties that are robust and well-adapted to your climate and hardiness zone, and prefer heirloom and resistant varieties.
Choose vegetables that are easy to cultivate like lettuce, Swiss chard, garlic and beetroots.
It’s also good to have vegetables that grow fast, like radishes, beets, Swiss chard and spinach and veggies you can harvest for a long time, like lettuce, runner beans, leek, stalk celery and kale.
Small vegetable garden: Make a cultivation plan
Now that you have your list of vegetables, it’s time to make a plan. If you have patches or raised beds, draw them on paper and outline which plants you want to grow where. To make the best of your space, combine high and low-growing plants.
The right combinations
Randomly mixing vegetables can work, but usually, it won’t. It’s good, therefore, to know which plants to grow together and how to combine different veggies.
Now that we have a plan, we prepare our patches. No matter the kind of patches or pots we have to grow our vegetables in, soil preparation is essential for a good harvest. And what would be better than
Compost
Compost is a universal remedy. It improves the soil structure, stores water, provides nourishment for the soil organisms and nutrients for the plants.
A generous layer of compost on the soil is a great method to ensure a huge harvest.
“Homemade” compost is certainly best, but if you don’t have enough “homemade” compost, I recommend buying some from a composting plant. It’s usually of better quality than the stuff in plastic bags you can buy in the supermarket, and it’s cheaper.
Manure
If you have livestock and use their manure for the garden, the soil will become increasingly fertile with time. Chicken manure, for example, is a marvelous fertiliser.
Horse manure has less nutrients than other manure, but the nutrient content is very balanced. Yet, no matter what animals you have: your garden will profit from their manure in any case.
Even if you don’t have any livestock, you can ask on farms, horse stables, or other animal owners if you can have some manure for your garden.
The only thing you have to keep in mind is that fresh manure is usually too „hot“ for most plants, and they would burn. For that reason, you must compost it before you can use it in your garden.
Cultivating your small vegetable garden
Made a plan: check
Prepared the soil: check
Now we can plant!
Intensive cultivation
When you use compost to enhance your soil’s fertility, you can plant your vegetables more closely than indicated on the seed packages. Especially leafy vegetables can be planted closer together and a smaller planting distance means a higher yield.
Another example is head cabbage, which needs a lot of space as it grows relatively expansive, and we should plant it with the right spacing.
Normally.
We can intensify the space yield, however, when we plant leeks between the cabbage rows. The cabbage grows on the ground and leeks at the “first floor” without them getting in each other’s way.
Pots and containers
For most gardeners, tomatoes and cucumbers are a must-have. Unfortunately, they require a comparatively large space to grow healthily and bring a good harvest. Instead of growing them in our patches or raised beds, therefore, we plant them in pots and containers. Just make sure that the pots are large enough and that you put them in a protected, sunny spot.
Attract pollinators in small vegetable gardens
Fruiting vegetables like tomatoes and cucumbers, but peas and beans, as well, need insects to pollinate them. To attract these pollinators, it’s a good idea to plant blooming herbs or (edible) flowers like calendula or nasturtium between our veggies or around the patches. Bees and other pollinating insects will love them, and as a thank you, pollinate your veggies.
Harvest
Many gardeners hesitate when it comes to harvesting, but harvesting is our goal, isn’t it?!
When you cultivate vegetables that can be harvested for a long time, like lettuce, runner beans, leek, stalk celery and kale, make sure to harvest them continually throughout the season. That way, you drive them to grow more leaves or fruits.
As soon as you have harvested any veggies completely, sow or plant immediately afterwards so that the next batch of veggies is on its way.
Having fewer vegetables makes us want to use more parts of them. Did you know, for example, that you can mix the leaves of beetroots, carrots and Florence fennel with your lettuce? Or that the leaves of radishes make a wonderful pesto? You can also cut off garlic greens and put them in your salad or cook with them. They have a mild garlic taste and improve every dish.
Lastly, why not harvest edible wild plants that grow in your garden? One of the most dreaded weeds, goutweed, for example, can be perfectly baked into pancakes or used up for a wild herb pesto.
The leaves of stinging nettle can be mixed with spinach or cooked into a soup.
Vegetable garden, greenhouse, balcony, or patio: Cucumbers thrive in many environments and brighten your summer with fresh, crisp fruits. They are a vegetable that can be easily seed-started indoors. Let’s have a look at how it works.
Cucumber varieties
Depending on where they grow, there are different varieties of cucumbers. Snack and pickling cucumbers grow well outdoors and even in pots, while snake cucumbers prefer to be cultivated in a greenhouse.
Seed-starting cucumbers for greenhouse cultivation
Many cucumbers for the greenhouse produce only female flowers, which makes them more productive.
Cucumber varieties with only female flowers are also called “parthenocarpous”. That means that they don’t need male pollen for fertilisation and don’t produce seeds.
If you choose a parthenocarpous cucumber variety, make sure that you don’t plant other varieties with male flowers in the vicinity. Otherwise, bees could bring in male pollen – and you‘ll get a smaller harvest.
Seed-starting cucumbers for outdoor cultivation
Outdoor cucumber varieties are often smaller and have less smooth skin, but they often taste more aromatic and stay fresher and crispier.
If you want to cultivate your cucumbers in an unprotected place, I recommend the robust outdoor varieties. They are not as prone to mildew as the more sensitive greenhouse cucumbers.
But cucumbers are not only for fresh consumption. There are several varieties, especially for preserving. My favourite variety for pickles and ferments is „Boston Pickling“. Its fruits stay smaller, and they grow well outdoors.
The right time
At the beginning of April, you can seed-start cucumbers indoors. I also recommend sowing cucumbers in several batches between April and mid-June. This succession planting will make sure that you can harvest cucumbers throughout the whole season.
Seeing that sometimes older plants get infected with (real or false) mildew, a further batch provides you with fresh fruits.
Seed-starting cucumbers: 8 steps for healthy seedlings
To make sure seed-starting will be a success, let’s go from sowing to transplanting step by step!
#1 How many do I need?
If you want to be self-sufficient with cucumbers, I recommend cultivating two to three plants per household member. For pickling and fermenting you can even calculate some more. That way, you can preserve cucumbers for the winter months.
#2 Equipment
Fortunately, there’s not much equipment you’ll need:
pots of about 10 x 10 cm (4 x 4 inches)
matured compost or cultivation soil
cucumber seeds
a small watering can or a ball shower
Did you ask yourself if you could sow in compost? Yep, that’s possible, BUT only in mature compost. If it looks dark and smells like a forest, it’s ready for seed-starting.
#3 How to sow cucumbers
Take your pots, fill them with mature compost or cultivation soil and make a hole of about 2 cm in it. There, you put in two seeds. Unfortunately, there’s always the risk that some seeds won’t germinate. By putting two seeds into the pots, we minimize that risk. If both germinate, rip out the weaker plant (even if it’s hard for you).
Now cover the seeds with soil, press it slightly and water the pots with the watering can or ball shower.
#4 Do NOT thin out cucumbers
Cucumbers don’t like it when their roots get messed with. For that reason, we seed-start them in pots that are large enough for them to grow until they’re transplanted outdoors or into the greenhouse without being uprooted.
#5 Temperature and light
Cucumbers like it hot, about 25 °C (77 °F), for germination. I usually place the pots above the radiator, or I use a heating mat to create a cosily warm atmosphere for my cucumber babies.
When the have germinated and look out oft he soil, they need less temperature but more light. At that stage, I move them to the guest toilet where it’s a few degrees colder (18 – 20 °C / 64 – 68 °F). Now they need more light to grow, about 12 – 16 hours per day and at best special wavelengths.
It’s difficult to get that amount of light at the beginning of April which is why I have several plant lamps installed. The right light is essential for a sturdy growth. If there’s too little, the plants will get leggy and weak.
When your cucumbers are 2 – 3 weeks old, they need their first dose of fertiliser. It’s best to use a liquid fertiliser that you dilute with water (I usually use half the amount indicated on the package) and water your plants with it.
At that stage, cucumbers need a small dose of nitrogen to get them going and induce a helathy growth.
#7 Watering
You shouldn‘t water any seedlings from above but rather into the saucer or holder. That way, the water can absorb up into the pot and the seedlings can take how much they need. It’s the simplest and best way to water seedlings, and you can even fertilise them that way.
But be careful: don’t over-water your seedlings! A short period with a slightly drier soil helps them to develop strong roots.
#8 Hardening off
Before planting your cucumbers outdoors (here that’s around the mid of May), you must harden them off to get them used to the harsher atmosphere outside. About a week before the „great day“, start to put them outside at a protected and shady place for 2 – 3 hours. Prolong that time over the next days and also put them into the sun. After about 7 days, they are hardened off enough to get transplanted outdoors.
Now you can also sow cucumbers directly into the patch.
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As spring fully takes hold, April is a pivotal month in the gardening calendar. The soil is warming, daylight hours are increasing, and plants are awakening with renewed vigor. This month presents the perfect opportunity to set your garden up for success throughout the growing season. Let’s see what garden tasks wait for us in April:
#1 Weeding
Earlier in March, we pulled the mulch off the patches so that the sun could warm the soil. With rising temperatures, however, weeds will also find their way towards the light. Now, when they’re still small, is the right time to pull them out and keep the patches free for our vegetables.
#2 Harden off seedlings
Some of the vegetables we have seed-started indoors during the last weeks can be planted outdoors in April. Before we do that, we must harden them off so that they won’t get a shock when they get from that cozy, protected atmosphere indoors to the outside garden where temperatures are colder and the wind can blow harshly.
To harden off our seedlings, we put them outside in the shade. At first, for a few hours and each day longer. After about a week, they can be planted outside.
If you want to know which vegetables you can plant outdoors now, read on here.
#3 Sowing and planting outdoors
The greatest garden task in April is sowing and planting! So many vegetables can now be sown and planted outdoors, cabbage, leeks, radishes and peas being only some of them. For a comprehensive list of vegetables you can sow and plant outdoors in April, read on here.
#4 Fertilising
Our vegetables have outgrown the baby and toddler stage and are now teenagers. Ravenous teenagers! Which means they need plenty of food, or in that case, fertiliser. After planting our seedlings outdoors, they’ll be grateful for a healthy dose of organic liquid fertiliser to push their growth.
#5 Protect seedlings from cold
Sowing and planting outdoors brings so much fun, but remember that it can still get cold, especially during the nights. In my hardiness zone 7b, the danger of frosts won’t be over before mid-May! To protect our sensitive seeds and baby vegetables from harsh weather, we must cover them with a fleece. Although that won’t seem much, it will be enough to keep the air and soil underneath well above freezing.
#6 Protect cabbage and leeks from pests
Cabbage and leeks that we can plant outdoors now are especially prone to pests like the cabbage white butterfly and the leek fly. To protect them, we can cover them with a protective net, which is much lighter than a fleece. It won’t keep off the cold but only the pests. Most often, you can buy protective nets as a set with half-arches that you can stick across the vegetables and put the net on top. That way, our plants have plenty of room to grow while being safe from pests. Just make sure that you fix the net thoroughly into the ground.
By the way, celery is a good companion for cabbage. In the unlikely event that a cabbage fly finds its way under the net, it may find itself repelled by the celery smell.
#7 Protect your seedlings from snails and slugs
Is there any pest more feared than snails and slugs? I don’t think so. They are practically everywhere and, especially in spring, eat all they can find. Our seedlings are kind of a huge buffet to them, and if we want to harvest some vegetables for ourselves, we must make sure that snails and slugs won’t get near them!
A good way to keep those little suckers off our seedlings is to put snail collars around them which they can’t overcome. Or you get out in the wee hours of the morning or in the evening with a bucket and collect them. Choose your way, but I prefer the collars.
#8 Plant tomatoes in the greenhouse
By the end of April, you can plant your tomato seedlings into the greenhouse. It’s still a good deal too early for outdoors but in the protected atmosphere of a greenhouse – and if there’s no forecast of severe frosts – planting them in the greenhouse is okay.
#9 Plant strawberries
Another garden task in April is planting new strawberries and protecting them with a fleece. If you have strawberries in your garden already, remove all wilted leaves now. They may be infected with diseases and, by removing them, you can prevent those from spreading.
#10 Pollinators
All fruit-bearing vegetables, as well as fruit trees and bushes, need pollinators to produce their fruits. We can help attract all those bees and insects by sowing flower strips as insect pastures, either on the borders of our vegetable garden or in the patches between the plants. Calendula, for example, is not only a great attractor for pollinating insects but can be used for teas as well as an ingredient in many homemade body care products.
The gardening season has started! Let’s get out and green the world.
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April marks the exciting transition when your vegetable garden truly comes to life. As soil temperatures rise and the threat of frost begins to fade in many regions, this month offers the perfect opportunity to get your hands dirty and lay the foundation for a great harvest.
With longer days and warming temperatures, April is prime time for both direct sowing and transplanting a wide variety of vegetables. Whether you’re a seasoned gardener or trying your hand at growing food for the first time, this month’s activities will set the stage for months of fresh, homegrown produce.
Let’s explore what vegetables you can sow and plant in April in your garden and how to give them the best start for a successful growing season.
Sow winter leek indoors now. I either sow 2 – 3 seeds per small pot, or I take a larger container and sow them in rows that I will be thinning later.
Brassicas
Although we can plant the first batch of brassicas like broccoli, kohlrabi, cauliflower, white and red cabbage outdoors now, we should still sow a second batch indoors. That way, we can transplant them outdoors several weeks from now and have a continuous harvest of brassicas instead of one overwhelming flood of harvest.
Seeing that those second batches will be outside in summer, we may have to choose late instead of early varieties.
Lettuce
Like with cabbage, the second round of lettuce-starting has begun! Now, however, we want to choose varieties that like warmer weather, like, for example, iceberg and oak leaf lettuce.
Tomatoes
If you haven’t seed-started tomatoes for outdoor planting already, mid-April is the latest time to do so. Sow several seeds per pot and thin them later.
Cucurbitaceae
The family of Cucurbitaceae consists of cucumbers, zucchini, melons and pumpkins, and they can all be seed-started indoors in April. None of them, however, takes thinning very well and
Vegetables we can sow outdoors in April
Broad beans
The beginning of April is the latest time to sow broad beans. They are very tolerant of low temperatures and can even withstand light frosts, which is why they don’t need protection against the cold.
Peas / Sugar peas
There are early varieties that can be sown outdoors mid to end of March. Just remember that peas are climbers and therefore install a trellis or net between the rows.
Carrots
Again, we’re talking early varieties here. If you planted onion bulbs in autumn, sow the carrots in the rows between the onions. That way, carrots and onions will protect one another from harmful pests.
Radishes
Carrots need quite some time to germinate, and it’s difficult, therefore, to weed the rows. A trick to still see where the carrots have been sown is to mix radish seeds between the carrot seeds. Radishes need only a few days to germinate and then not only show us the row but are a yummy vegetable for salads or as a ferment.
Lettuce
Contrary to the varieties we start indoors now, lettuce we sow outdoors in April has to be very tolerant against cold temperatures, like Asia lettuce. If we mix the early varieties we sow now and the later varieties we seed-start indoors, we can continually harvest different kinds of leafy greens. This method of sowing vegetables every 3 – 4 weeks is called succession planting which not only ensures a continuous harvest but also that the soil in our patches is always covered.
All lettuce varieties germinate in light only. Do not cover them with soil!
Rocket salad
is an easy one! Sow it, harvest he leaves, and when you let it bloom, it will spread itself.
Spinach
Spinach is almost a no-brainer: sow it, cover it with winter protection fleece and just let it grow. It’s usually quite tolerant of the cold and will grow well under protective cover.
Beetroot
Although you can seed-start beetroot indoors, that’s only advisable when you have a small garden or want to grow just some of them. In our family, we need plenty of beetroot for salads, pickles, fermented or cooked, and that’s why I sow them directly in April.
Salsify
Salsifies need a deep, loose soil to grow long, straight roots. A patch where potatoes grew the year before would therefore be ideal.
Planting outdoors
Before we plant anything outdoors, it’s important to harden the seedlings off by gradually exposing them to outdoor temperatures. Start by putting your plants outside or in the greenhouse for 2 – 3 hours at first and prolong that time over a week before transplanting.
Lettuce
The lettuce that we started in February or March is now ready for transplanting outside. Make sure that the seedlings are not planted too deeply, or they may rot. As a rule of thumb, put them into the soil as deep as they were in the pot.
Brassicas
All early brassica seedlings like kohlrabi, early Savoy cabbage and cauliflower as well as white and red cabbage, can be planted outdoors in April. Leave plenty of space between the seedlings so that you can plant celery in between later. Cabbage and celery are great companions in the patch and repel each other’s pests.
Leek
Plant leeks between the cabbage rows. That way, you not only make the best use of space here, seeing that cabbage grows on the ground and leek on the “first floor”, but they also deter pests from one another. For best protection, however, cover them with a pest protection net.
Like garlic, onions and shallots can be planted now. Either plant small bulbs you can buy at the nursery or the seedlings you’ve started indoors earlier that year.
Potatoes
In my hardiness zone 7b, I don’t plant potatoes before the end of April. Considering that our last night frosts can happen until mid-May, the end of April is perfect for putting the pre-sprouted potatoes in the ground. When the shoots start looking out of the soil, the worst weather will be over.
The gardening season has officially started! Time to dig in the dirt!
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In an ideal world, we would just take the time once to make a planting plan for your vegetable garden and then stick to it for all the years to come. That would be so conventient, wouldn’t it? Alas, it doesn’t work that way. Cultivating the same plants in the same place again and again would leach out the soil over the years and bring little to no harvest. The solution to this problem is to implement a rotational system where crops are planted on a different field every year until they reach that first field again. This concept is what we know as crop rotation.
But crop rotation isn’t just an old farming technique: In a vegetable garden where we intensively cultivate a small(ish) amount of soil for maximum harvest, we also use crop rotation to keep the soil fertile and our plants healthy. In this post, I’ll show you what crop rotation is, how it will help you to get healthier plants, fewer pests and more abundant harvests and how you can integrate it into your garden plan. Let’s dive into everything you need to know about this game-changing practice!
What is crop rotation and what are its benefits?
Crop rotation is the concept of NOT cultivating the same plants in the same place year after year. That way, we avoid pests and diseases from getting the upper hand. There are many pests and diseases that specialize in one plant or plant family (see below). By rotating our crops, we keep them at bay and diminish the risk of them getting ground and permanently invading our garden.
Another benefit of crop rotation is the soil’s nutrient content and thus its fertility. As you know, we can categorize vegetables as heavy, medium and light feeders, that is, plants with high, medium or low nutrient demands. Cultivating cabbage, for example, which is a heavy feeder, for years in a row would leach out the soil fast of the many nutrients cabbage needs to grow healthily.
However, nutrient supply by crop rotation is not as important for vegetable gardening as the disruption of pest and disease cycles. After all, we do add compost and fertilisers to supply nutrients. For the same reason, a fallow where we grow nothing but a cover crop on a bed will not be necessary in vegetable gardening.
Together with companion planting (mixed culture), the use of eco-friendly fertilisers and plant protection, crop rotation is an important pillar for the long-term sustainability of our gardens.
How to use crop rotation in your vegetable garden
First of all, we need to understand the different groups of vegetables. The best way to do so is to either categorize our vegetables by the “family” they belong to or by what we want to harvest from them.
Understanding Plant Families
Plants, like humans, belong to different families. It’s important to know which plants are members of the same family as they usually show not only similar nutrient needs but also attract the same pests and diseases.
Here’s a short overview of the most common plant families and their requirements:
Family: Poaceae (sweet grass) Vegetables: Corn Nutrient uptake: medium
Understanding plant categories
Apart from plant families, we can also sort our vegetables depending on what we want to harvest from them.
There are five categories:
Category: Leafy vegetables Vegetables: Lettuce, spinach and Swiss chard Nutrient uptake: medium to high
Category: Brassicas Vegetables: Cabbage, Brussels sprouts, kale, broccoli, cauliflower, Savoy cabbage and kohlrabi. Nutrient uptake: high
Category: Fruiting vegetables Vegetables: Tomatoes, zucchini, pumpkins, peppers, eggplants, cucumbers, melons and potatoes Nutrient uptake: high (especially potassium and phosphorus)
Category: Root vegetables Vegetables: Carrots, turnips, parsnips, beetroots, radishes, parsley, onions and garlic Nutrient uptake: medium
Category: Legumes Vegetables: Beans, peas, lentils, chick peas, soy beans and peanuts Nutrient uptake: low; fix nitrogen into the soil
Crop rotation in practice
With two possibilities of dividing vegetables into groups, we also have two options for planning our crop rotation. But first of all, we need to
Make a garden plan
Before the planting comes a plan. Make a list of all the vegetables you like and want to cultivate. If you’re a fledgling in vegetable gardening, start small and only take a few crops. Then, draw a map of your garden beds, raised beds or containers and divide them into sections for each crop group.
At the beginning of your garden journey, I’d recommend sorting the vegetables by category (leafy veggies + brassicas, fruit bearers, root vegetables and legumes). Divide your vegetable garden into quarters and cultivate one category per quarter.
If you choose to group your vegetables by family, think about how many plants per variety you’ll need and plan the size of the zones accordingly.
Crop Rotation by Category
Legumes have the extraordinary ability to gather nitrogen from the air and fix it in their roots. For that reason, we only cut legumes after harvesting and leave their roots in the soil to enrich it with nitrogen.
Plant leafy vegetables and brassicas after legumes as they need the nitrogen the legumes have fixed.
Fruiting vegetables follow leafy veggies and brassicas. Fruiting vegetables don’t need as much nitrogen as leafy veggies and brassicas, but rather potassium and phosphorus. Too much nitrogen can even prevent them from producing many fruits. The leafies and brassicas will have consumed enough nitrogen in the season before so there’ll be no problem on that front.
Plant root vegetables after fruiting vegetables. Root vegetables need even less nitrogen than fruiters. At the same time, they’ll break up the soil which legumes, that you should plant afterwards, love.
Rotating by plant category can be easily implemented. Divide your gardening space into quarters and plant a different category in each quarter. The next year, just rotate by one bed. That way, fruiters are followed by root vegetables. After that we plant legumes and in the fourth year leafy vegetables and brassicas and brassicas.
Crop Rotation by Plant Family
If you want to rotate your vegetables by plant family, you must first look at their nutrient needs. Basically, you plant medium feeders after heavy feeders and then cultivate nitrogen fixers to replenish the soil. This could look as follows:
Brassicaceae (cabbage family) need lots of nitrogen, so they are best planted after legumes, which are nitrogen-fixers.
Root vegetables break up the soil, which makes it great for potatoes and tomatoes that need to grow deep.
Legumes like peas and beans love the loose soil that, for example, potatoes leave behind.
Members of the umbelliferae family, like carrots and parsnips, are light to medium feeders and can follow vegetables of any other group.
Rotating by plant family can be a bit trickier at first, but it also gives you more alternatives to mix your vegetables, especially when it comes to succession planting and follow-up crops.
Nightshades and Umbellifers (tomatoes, pepper, eggplant etc. and carrots, celery, parsley etc.) – Poaceae (corn) and Asteraceae (lettuce, salsify) – Brassicaceae (cabbages, radish) and Liliaceae (onions, chives, garlic) – Cucurbitaceae (cucumbers, melons, pumpkins, zucchini) and Legumes (peas, beans)
Crop rotation and succession planting
Most vegetables don’t occupy the garden for the whole season, so we plant fast-growing crops before or after them. This is called succession planting and we also need to observe the rules of crop rotation here. It’s not good to plant late cauliflower after early broccoli, for example, because, as you know by now, they are from the same family and category and thus have the same nutrient requirements and attract the same pests and diseases. You’ll find more details on succession planting over here.
A cleverly planned succession of vegetables will leave your soil healthy and nutrient-rich, while your plants will benefit from one another and produce a great harvest.
Here are some examples of succession planting that take crop rotation into account:
Plant late cabbage varieties, lettuce or onions after potatoes
Cultivate radishes, lamb’s lettuce, spinach or kohlrabi after broad beans
When you’ve harvested garlic, plant strawberries on that bed or sow broad beans; the year after that the bed is ready for heavy feeders like cabbages or Cucurbitaceae.
After onions, you can sow endives, radicchio, beetroot, or Swiss chard.
Plant bush beans, spring onions, Swiss chard, spinach or late cabbage varieties after fennel.
How to rotate crops in small gardens
You may only have a small space for vegetable gardening and that’s okay. In fact, most home gardens are not very large and that may make it difficult to rotate and effectively space apart different veggies. Nevertheless, you should still try to do it as best as possible to keep pests and diseases at bay and help maintain soil fertility.
Here are a few tips on how to rotate crops in small gardens:
Raised beds
If you have only a small space for gardening, building three to four raised beds may be a good idea. That way, you can rotate your crops according to one of the plans above while having a solid barrier between each area, although they may be close to one another.
Container gardening
Using containers is similar to raised beds and I especially recommend it for vegetables that are prone to diseases like tomatoes. Like with raised beds, there is a physical barrier between the containers and the rest of your vegetable garden and the risk of spreading diseases across beds is minimal.
Scattered beds
Who says that all vegetables must be grown in one place? Admittedly, when it comes to watering or harvesting, it’s easier to have all vegetables in the same location, but you can also create “pockets” and grow veggies on beds scattered around your garden. That way, it’s easy to rotate crops and make sure that diseases do not spread.
Advanced Crop Rotation Strategies
Integrating cover crops into your rotation schedule
Cover crops are great for replenishing nutrients while at the same time covering the soil. Cultivating cover crops counts as fallow in the vegetable garden, whether it’s during the whole season or just a part of it. However, cover crops also belong to plant families and can be “siblings” of our veggies. It’s important to know, therefore, who is related to whom to avoid leaching the soil and spreading pests and diseases.
Here is an overview of common cover crops and their family membership:
Family: Legumes Members: Cowpea, red clover, white clover, crimson clover, sun hemp
Family: Brassicaceae Members: Rapeseed, yellow mustard, oilseed radish, field turnip
Make sure to consider these family memberships when planning your crop rotation. For example, don’t grow any cabbages in a bed where brassica cover crops like rapeseed or mustard were grown before. Also, cultivating corn after, for example, winter barley or oats may be difficult.
Companion planting and crop rotation
Companion planting means planting those vegetables together (that is alternating or in close proximity to each other) that help each other grow better. For example, corn and beans are amazing plant buddies: corn provides a natural support for bean vines to climb, while beans add nitrogen to the soil, which helps corn grow stronger. Another great pair is tomatoes and basil – basil helps keep pesky insects away from tomato plants, acting like a natural bodyguard. If you want to learn more about companion planting, you’ll find a comprehensive guide here.
When we use companion planting within our crop rotation system, we’re basically creating a superhero team of plants. Each plant brings its own special power to the garden. Some plants, like marigolds, can chase away harmful insects, while others, like clover, can improve soil health by adding nutrients. This method is not just smart gardening – it’s a way of working with nature instead of fighting against it, helping to grow healthier crops and take better care of the earth.
Companion Planting in Crop Rotation: Four Strategic Examples
Nitrogen-Fixing Legume Rotation with Heavy Feeders
Rotation Sequence:
Year 1: Plant bush beans or peas (nitrogen-fixing legumes)
Year 2: Follow with heavy-feeding corn or brassicas
Companion Planting Strategy:
Interplant beans with carrots and radishes
Plant pumpkins with corn to cover the soil
Benefits: Beans naturally enrich soil with nitrogen, supporting next year’s nutrient-hungry crops
Brassica and Allium Rotation with Root Crops
Rotation Sequence:
Year 1: Grow cabbage family crops (broccoli, kale etc.)
Year 2: Plant root crops like carrots and parsnips
Companion Planting Strategy:
Interplant onions and garlic with carrots to deter carrot flies
Use calendula as a trap crop to attract beneficial insects
Benefits: Breaks pest cycles, improves soil structure, reduces disease pressure
Nightshade Family Rotation with Soil-Building Crops
Rotation Sequence:
Year 1: Tomatoes and peppers
Year 2: Cover crops or green manure (like clover or buckwheat)
Companion Planting Strategy:
Plant basil near tomatoes to improve flavour and repel pests
Grow marigolds around nightshades to deter nematodes
Benefits: Restores soil health, interrupts pest and disease cycles
Cucurbit and Herb Companion Rotation
Rotation Sequence:
Year 1: Cucumbers, squash, and melons
Year 2: Grow nitrogen-fixing legumes
Companion Planting Strategy:
Plant dill and nasturtiums with cucumbers
Interplant radishes to deter cucumber beetles
Benefits: Enhances pollination, natural pest control, soil nutrition improvement
How do you know if your rotation is working?
How would you know if your rotation system is working? Well, first of all, take a close look at your soil. It should have a deep brown to almost black colour, which indicates an increased amount of organic matter and a high nutrient content.
Secondly, track pests and diseases over several seasons and check if they have at least not spread, at best diminished.
The harvest yield, of course, is also a good indicator of whether your rotational system works. A good harvest shows good, rich soil which will be a result of a well-working crop rotation.
Start crop rotation now!
Implementing crop rotation in your vegetable garden is one of the smartest decisions you can make for long-term gardening success! The guidelines in this post show you what to do to keep your soil healthy, diminish pests and diseases and have a great harvest year after year.
And remember that even small gardens benefit enormously from crop rotation!
Start planning your garden’s crop rotation right now, and I promise you that by this time next year, you’ll be amazed at the difference in its productivity and health! Your soil will be replenished with nutrients, you’ll have healthy plants and above all, you’ll gather an abundant harvest.
