Almost every vegetable garden falls into a pattern nobody planned. Tomatoes go in the warm bed against the wall because that is where tomatoes go. Carrots get the light soil at the far end. Cabbages land wherever there is room. Around year five things slip: cabbages stay small and wilt at midday in wet soil, carrots fork, onions rot in storage.
Crop rotation is the fix, and it costs nothing – no products, no new soil, no sprays, just a sheet of paper recording what grew where. Here is which crops share a family, how many years each needs off, a ready-made four-year plan bed by bed, what to do with only two raised beds, and how to keep track without turning the garden into paperwork.
Crop rotation at a glance
| Feature | Detail |
|---|---|
| What it is | Planned movement of plant families between growing areas, year by year |
| Most common cycle | Four years, four beds, four groups |
| Shortest useful cycle | Three years |
| Recommended cycle for brassicas | 6–7 years |
| Core rule | Never the same family twice running on the same ground |
| Classic order | Legumes → brassicas → potatoes → roots and onions |
| Families to track | 7–9 in a typical kitchen garden |
| Does not apply to | Perennials: rhubarb, asparagus, sunchokes, soft fruit, woody herbs |
| Biggest benefit | Soil-borne diseases never get a chance to build up |
| Second benefit | Nutrient draw evens out between deep and shallow rooted crops |
| Hardest family | Brassicas – clubroot resting spores stay viable 10 years or longer |
| Problem rotation cannot fix | Onion white rot – sclerotia survive at least 15 years |
| Smallest workable area | Two raised beds, if you split each one in half |
| Planning time per year | 20–30 minutes in January or February |
| Records needed | One sketch per season, kept in a folder or a spreadsheet |
| Difficulty | Low to start, moderate to sustain over a decade |
Contents
- Crop rotation at a glance
- Why does crop rotation actually matter?
- Vegetable families – which crops belong together?
- How many years before the same family comes back?
- The classic four-year rotation
- Three-year and five-year rotations
- Why do heavy feeders follow legumes and roots come last?
- Green manures and cover crops in the rotation
- Crop rotation in raised beds and small gardens
- Perennial crops that sit outside the system
- How to keep a garden plan year by year
- Zone table: planning and cover crops in USDA zones 3–6
- Rotation in a greenhouse or polytunnel
- Common mistakes
- Frequently asked questions
Why does crop rotation actually matter?
Three things happen in soil when the same crop stays put year after year. They look independent but reinforce each other, which is why the decline often arrives suddenly after several good seasons.
Soil-borne diseases build up
This is the strongest reason. Most pathogens are specialists: clubroot attacks brassicas and nothing else, white rot attacks alliums and nothing else. As long as the host returns every year the fungus multiplies undisturbed. Remove it for several years and the population starves down.
Clubroot, caused by Plasmodiophora brassicae, produces swollen, distorted roots and plants that wilt at midday in wet soil. The University of California IPM programme describes resting spores that stay viable for ten years or longer, and research reviewed at the Swedish University of Agricultural Sciences puts their half-life at roughly 3.6 years, with levels still measurable after about fifteen. That is why brassicas get six to seven years off rather than four.
Onion white rot, Sclerotium cepivorum, forms black sclerotia the size of poppy seeds. The Royal Horticultural Society states they remain in the soil for at least fifteen years, which makes rotation impractical as a cure – the answer is keeping the disease off boots, tools and bought sets, as covered in the guide to how to grow garlic. White mould, fusarium wilt, violet root rot and most storage rots behave the same way.
Nematodes multiply
Most soil nematodes are harmless or useful. A few are not. Potato cyst nematode lays eggs inside cysts that shrug off frost and drought; eggs and juveniles stay alive in the cyst for up to fifteen years, hatching a little each season. The hosts are potato, tomato and aubergine, which is why a four-year minimum between potato crops is standard, backed by resistant cultivars where the pest is known. Stem nematode on alliums and beet cyst nematode work the same way: tied to one family, more numerous each year it stays, starved out when it leaves.
Nutrient draw goes lopsided
Different crops take different amounts from different depths. Cabbage and squash strip nitrogen from the top 30 cm (12 in). Carrot and parsnip reach 60–80 cm (24–32 in) and find nutrients the cabbage never touches. Peas and beans leave nitrogen behind. Park the heavy feeders on the same square every year and the imbalance is one that extra compost only partly repairs, because the soil microbes specialise too.
Pests and weeds lose the thread
Carrot rust fly overwinters as a pupa where the carrots stood and emerges next spring expecting dinner; move the bed ten metres (33 ft) and it has to find them first. Dense crops such as potatoes and squash also smother annual weeds, so a rotation that gives every bed one such year keeps weed pressure down for free.
Vegetable families – which crops belong together?
Everything rests on one idea: the family matters, not the crop. A radish and a cabbage look nothing alike, but both are brassicas and both carry clubroot. Tomato and potato are one family, as are spinach and beetroot. Take one thing from this guide: the table.
| Family | Crops | Feeding level | Years off | Main soil-borne problems |
|---|---|---|---|---|
| Nightshades Solanaceae | Potato, tomato, pepper, chilli, aubergine, tomatillo | Heavy | 4 | Potato cyst nematode, early blight, verticillium and fusarium wilt, scab |
| Brassicas (mustard family) Brassicaceae | Cabbage, kale, broccoli, cauliflower, Brussels sprouts, kohlrabi, swede, turnip, radish, pak choi, rocket, mustard, cress | Heavy | 6–7 | Clubroot, black rot, downy mildew, cabbage root fly |
| Legumes Fabaceae | Pea, mangetout, broad bean, bush and pole bean, runner bean, clover, alfalfa, vetch | Light – adds nitrogen | 4, but 6–8 where root rot is present | Aphanomyces root rot, grey mould, white mould |
| Umbellifers (carrot family) Apiaceae | Carrot, parsnip, celeriac, celery, fennel, dill, parsley, coriander, lovage | Moderate | 4 | Violet root rot, storage rots, carrot rust fly, aster leafhopper |
| Alliums (onion family) Amaryllidaceae | Onion, shallot, garlic, leek, chives, spring onion, Egyptian onion | Moderate | 4–6 | White rot, stem nematode, downy mildew, onion rust, allium leaf miner |
| Goosefoot family Amaranthaceae | Beetroot, golden beet, chard, spinach, quinoa, orach | Moderate | 3–4 | Beet cyst nematode, cercospora leaf spot, heart rot from boron deficiency |
| Cucurbits (squash family) Cucurbitaceae | Cucumber, courgette, summer and winter squash, pumpkin, melon | Heavy | 3–4 | Fusarium wilt, bacterial wilt, powdery and downy mildew |
| Daisy family Asteraceae | Lettuce, endive, chicory, salsify, sunchoke, globe artichoke, marigold | Light to moderate | 2–3 | White mould, lettuce downy mildew, lettuce root aphid |
| Grasses Poaceae | Sweetcorn, maize, rye, oats, barley, wheat as a cover crop | Heavy | 1–2 | Few – this group is often used as a cleansing break crop |
Two entries deserve a warning. Radish is a brassica, and radishes are a favourite gap-filler – sown between rows in every bed they spread clubroot across the plot and reset the clock where you least want it. Rocket, mustard and cress are brassicas too, and mustard is sold as cover crop seed. More on that trap below.
Crops you can put anywhere
Some crops carry so few family-specific soil problems that you can place them wherever it suits: sweetcorn, lettuce, salad leaves, potted herbs and most annual flowers. The RHS treats peppers and aubergines as flexible too, because in cold climates they almost always live in a greenhouse or container. Lettuce is the most useful filler in the system – it slots into any group without disturbing the rotation.
How many years before the same family comes back?
The rest period is the point of crop rotation, and where advice varies most. The number is set by the disease, not the plant – and diseases live different lengths of time.
| Problem | Affects | Survival in soil | Practical years off | Is rotation enough? |
|---|---|---|---|---|
| Clubroot | Brassicas | 10 years or longer; half-life about 3.6 years | 6–7 | Yes, combined with high pH |
| Onion white rot | Alliums | At least 15 years | 6 or more | No – keep it out instead |
| Potato cyst nematode | Nightshades | Up to 15 years inside the cyst | 4, plus resistant cultivars | Partly |
| Stem nematode | Alliums | Several years; usually arrives on sets | 4 | Yes, if planting stock is clean |
| White mould (sclerotinia) | Lettuce, beans, carrots and many others | Several years, very wide host range | 3–4 | Partly – too many hosts |
| Aphanomyces root rot | Legumes | Very long, often over 10 years | 6–8 | Yes, but only on a long cycle |
| Violet root rot | Carrot, parsnip, beetroot | Several years on crop debris | 4 | Yes |
| Fusarium and verticillium wilt | Cucurbits, nightshades | Several years | 3–4 | Yes |
| Beet cyst nematode | Goosefoot family | Several years inside the cyst | 3–4 | Yes |
| Nutrient draw only | All | Not applicable | 2–3 | Yes, with feeding |
Read the table as a priority list, not a verdict. Without disease in the ground, three years covers most crops. Spot clubbed roots once and the cabbages leave that square for six years. The rest period is set by the worst problem you have – and counted from the last time that family stood there. A row of radishes in May resets the brassica clock as thoroughly as a bed of sprouts.
The classic four-year rotation
Four years is standard for a simple reason: it is the shortest cycle with reasonable margin on most diseases, and four beds fit in an ordinary garden. Split the area into four equal parts, sort the crops into four groups, and move each group one step a year.
The four groups
| Group | Families | Crops in the group | Feeding |
|---|---|---|---|
| A. Legumes | Fabaceae | Peas, broad beans, bush and pole beans, plus sweetcorn and lettuce as fillers | No nitrogen, potassium if needed |
| B. Brassicas | Brassicaceae | Cabbage, kale, broccoli, cauliflower, Brussels sprouts, radish, turnip, rocket | Plenty of compost or rotted manure; lime if pH is below 7.0 |
| C. Nightshades | Solanaceae | Potatoes, outdoor tomatoes, plus squash and pumpkin as fillers | Compost the autumn before, never lime |
| D. Roots and onions | Apiaceae, Amaryllidaceae, Amaranthaceae | Carrot, parsnip, celeriac, beetroot, onion, garlic, leek | No fresh manure, only well-rotted compost |
The rotation plan, bed by bed
Find the row for your bed and the column for the year.
| Bed | Year 1 | Year 2 | Year 3 | Year 4 | Year 5 (= year 1 again) |
|---|---|---|---|---|---|
| Bed 1 | A. Legumes | B. Brassicas | C. Nightshades | D. Roots and onions | A. Legumes |
| Bed 2 | B. Brassicas | C. Nightshades | D. Roots and onions | A. Legumes | B. Brassicas |
| Bed 3 | C. Nightshades | D. Roots and onions | A. Legumes | B. Brassicas | C. Nightshades |
| Bed 4 | D. Roots and onions | A. Legumes | B. Brassicas | C. Nightshades | D. Roots and onions |
Each group makes one circuit in four years, and each bed sees all four groups before anything repeats. The compost follows the group, not the bed: it goes where the brassicas will stand, never where the carrots will. Bed 1 has legumes again in year 5 – four years off, enough unless you have aphanomyces root rot.
Filler crops
No group fills a whole bed for a whole season. Use crops from the same group or the free ones – lettuce, chard, sweetcorn, autumn spinach – and write down what you sowed. Improvised gap-filling is the commonest reason a tidy rotation turns to guesswork by year three.
Three-year and five-year rotations
Three years – when space is tight
With three beds you merge groups. The RHS three-year version runs: nightshades, then legumes with onions and roots, then brassicas. Three years is the minimum that deserves the name and handles nutrient draw and the short-lived problems. Against clubroot it does not.
| Bed | Year 1 | Year 2 | Year 3 |
|---|---|---|---|
| Bed 1 | Nightshades | Legumes, onions and roots | Brassicas |
| Bed 2 | Legumes, onions and roots | Brassicas | Nightshades |
| Bed 3 | Brassicas | Nightshades | Legumes, onions and roots |
Five years – when you have room or trouble
A five-year rotation gives brassicas five years instead of four and space for a whole season of green manure: legumes, brassicas, nightshades, roots and onions, cover crop. That cover-crop year can be a year of squash if you would rather harvest something. With confirmed clubroot, go to six or seven years – six beds of 1.2 × 4 m (4 × 13 ft) is realistic in an ordinary garden.
Why do heavy feeders follow legumes and roots come last?
The order is not arbitrary. It follows nitrogen through the soil across four seasons.
Legumes leave nitrogen
Peas and beans partner with nitrogen-fixing bacteria in root nodules. The effect is often overstated – most of the nitrogen ends up in the pods you pick and carry off – but roots and haulm still leave a contribution. Cut the plants at soil level rather than pulling them, so the nodules stay put.
Brassicas take it up
Brassicas are the hungriest group in the garden. A Brussels sprout stands from May to November and builds several kilos of plant. Letting it follow the legumes is free fertiliser, which is why that order is standard in the RHS four-year plan.
Potatoes loosen and clean
Potatoes come third for two reasons. Earthing up and lifting works the soil to 25 cm (10 in), exactly what the roots want next year, and the haulm shades out annual weeds better than anything else in the system.
Roots and onions go last
They come last because they cannot handle fresh feeding. A carrot in freshly manured soil forks, because the taproot hits pockets of nutrient and splits, and onions in nitrogen-rich soil go soft and store badly. By year four the compost spread for the brassicas has broken down and nitrogen has fallen to a level the roots enjoy. Feed once per cycle and let the crops run down the fertility ladder – the guide to how to grow carrots shows what that means in the row.
Green manures and cover crops in the rotation
A green manure is a crop you sow to dig in rather than harvest. It keeps the soil covered so nutrients are not leached, builds organic matter with its roots, and fixes nitrogen if it is a legume – the most practical nitrogen source in a garden without livestock.
The trap almost everyone falls into
Mustard and oilseed radish are the two commonest cover crop seeds on the shelf, and both are brassicas – they belong in the brassica block and they reset the clubroot clock. A review at the Swedish University of Agricultural Sciences found white mustard badly affected as a catch crop: 84 per cent of plants infected against 8 per cent of oilseed radish. Never sow either where brassicas are planned within the next few years. Plenty of gardeners have spread clubroot across a whole plot by cover-cropping with mustard each autumn.
Cover crops that are safe
| Plant | Family | Sow | Effect | Watch out for |
|---|---|---|---|---|
| Phacelia | Borage family – no vegetable clash | May–August | Organic matter, bee forage, loosens soil | The safest choice; clashes with nothing |
| Buckwheat | Knotweed family – no vegetable clash | June–July | Fast cover, mobilises phosphorus | Frost tender, dies at first hard frost |
| Winter rye | Grasses | August–September | Overwinters, mops up nitrogen, huge root mass | Turn it in early in spring |
| Oats | Grasses | May–August | Organic matter, winter-kills into its own mulch | The easy option for beginners |
| Crimson and red clover | Legumes | May–July | Nitrogen fixation | Counts as the legume block |
| Hairy vetch | Legumes | May–August | Strong nitrogen fixation | Counts as the legume block |
| White mustard | Brassicas | May–August | Fast and cheap | Counts as brassicas – avoid where clubroot is a risk |
| Oilseed radish | Brassicas | July–August | Deep taproot that breaks compaction | Counts as brassicas |
Catch crops between two harvests
A catch crop sits between two main crops, often for six to ten weeks. After early potatoes or garlic come out in July there is time for oats or phacelia, cut down in October. The rule is the same as everywhere else: the catch crop has a family, and that family goes in the record.
Crop rotation in raised beds and small gardens
The usual objection is that crop rotation assumes four beds and most people have two. There are four ways around that, and they combine.
1. Split the beds in half
Two raised beds of 120 × 80 cm (4 × 2.5 ft) become four squares of 60 × 80 cm (2 × 2.5 ft) – enough for a four-group rotation: a row of peas, six kale plants, one sowing of carrots, a square of onions. The area per crop is small, but the rest period is correct, and that is what decides. The guide to raised bed gardening covers the dimensions and how to divide a bed.
2. Rotate in time instead of space
A raised bed carries two or three crops per season in zone 5 or 6. Spinach in March, broccoli in June, overwintering lettuce in August, and the square has hosted three families in one year. Not the same break as a full year off, but it evens out the nutrient draw.
3. Rotate only the families that need it
If you have to choose, move the brassicas, alliums and nightshades and let lettuce, sweetcorn, squash and herbs go where they fit. Those three account for almost every soil-borne problem in a home garden, and a rotation covering only them beats no rotation by a wide margin.
4. Change the soil
The last resort, and the only option in containers. In a raised bed replace the top 20 cm (8 in) every three or four years; in a pot change the whole volume yearly. If white rot has got into a container bed, new soil is the only real cure, because the sclerotia sit there for fifteen years.
Can companion planting replace rotation?
No, but the two solve different problems and work well together. Companion planting is about what stands next to what at the same time; crop rotation is about what stood there before. Marigolds among the tomatoes do nothing to the cyst nematodes already in the soil. There is more in the guide to companion planting.
Perennial crops that sit outside the system
Not everything should be rotated, and trying makes the plan unworkable. Perennials get a fixed position outside the crop rotation, ideally at the edge where they are out of the spade's way.
- Rhubarb stays put for 10–15 years before it needs dividing. Give it a corner and a generous compost mulch each autumn – see the guide to growing rhubarb.
- Asparagus is the longest-lived: a well-kept bed crops for 15–20 years and should never be moved without reason.
- Sunchokes are permanent in practice, because any fragment of tuber grows again. Put them where you can live with them forever, in a contained square.
- Horseradish behaves the same way and is best grown in a sunken container.
- Perennial herbs – chives, thyme, sage, oregano, mint – get their own bed. Mint in a sunken pot.
- Strawberries sit in between: perennial, but moved every three or four years because root diseases and grey mould build up. Many growers treat them as a block in a six-year rotation.
- Soft fruit and fruit trees have permanent positions. Just avoid replanting an apple on the site of an old one, because of replant disease.
Draw the perennials in first when you sketch the plot. They never move, so the rotation beds fit around them rather than the other way round.
How to keep a garden plan year by year
Crop rotation is not hard to understand. What is hard is remembering what stood where three years ago, and without records the system collapses in about three seasons.
- Draw the plot once, to scale. Graph paper, one square per half metre (18 in). Number the beds permanently and put those numbers on a marker in each bed, so they exist in the garden too. Mark the perennials and the shaded corners.
- Copy the base drawing onto one sheet per year. A folder of plastic sleeves works as well as a spreadsheet. What matters is one page per season you can flip back to.
- Write the group first, the crop second. At the top of each bed: group A, B, C or D. Only then fill in the actual crops. Errors become obvious immediately.
- Record during the season, not after. Every time you sow something unplanned – a row of radishes, a patch of spinach – write it onto the plan with the date. These are the sowings that otherwise wreck the record.
- Note the problems on the same page. "Clubbed roots on the kale in bed 3, 12 August" is the single most valuable line you will ever write. It decides where brassicas may stand for the next six years.
- Note feeding and liming. Where the compost went, how much, and where you limed. Lime and potatoes do not mix, and you need to look that up.
- Draw next year's plan in January. Take last year's sheet, move each group one step, and check against the rest-period table that nothing returns too soon. Twenty minutes at the kitchen table saves a season.
- Photograph the plan with your phone. Paper goes missing, and one picture answers "what grew here in 2024?" while you stand there with a spade.
A spreadsheet works as well: one tab per year, one row per bed, one column per month, and you can search it. For most people the combination wins – paper in the garden, spreadsheet in winter.
Zone table: planning and cover crops in USDA zones 3–6
The rotation itself is the same everywhere – families and rest periods do not change with climate. What changes is the window for cover crops and whether a catch crop fits after harvest. Typical figures for an average season.
| USDA zone | Typical areas | Plan next year's rotation | Last cover crop sowing | Cover crop winter-kills | Catch crop after early potatoes |
|---|---|---|---|---|---|
| 3 | Interior Alberta, northern Minnesota, interior northern Scandinavia | February–March | 10 August | Late September | No |
| 4 | Southern Manitoba, northern Maine, coastal northern Sweden | February–March | 20 August | Mid-October | Barely, 6–8 weeks |
| 5 | Southern Ontario, upstate New York, Michigan, Iowa, central Sweden | January–February | 1 September | Early November | Yes, 8–10 weeks |
| 6 | Ohio Valley, coastal New England, Scotland, southern Sweden, Denmark | January–February | 10 September | December or not at all | Yes, 10–12 weeks |
In zones 3 and 4 oats are the most practical cover crop, because they winter-kill on their own and leave a straw layer that protects the soil until spring. Winter rye suits zones 5 and 6, where it has time to build root mass before the ground freezes. In the coldest gardens it is better to leave the bed under crop residue and mulch than to force a cover crop that never establishes.
Rotation in a greenhouse or polytunnel
The greenhouse is the hardest place to rotate and needs it most. The soil sits still, never gets flushed through by rain, and almost always holds tomatoes or cucumbers – two families on the same ten square metres, year after year.
Four measures work. Split the house in half and swap tomatoes and cucumbers each year. Sow oats or phacelia in October and cut it down in March. Replace the top 15–20 cm (6–8 in) of soil every three or four years. And grow a winter crop of lettuce or mâche, six months under a different family. Growing tomatoes in bags or large pots answers the question outright, because the compost is renewed anyway – compare the setups in the guide to how to grow tomatoes.
Common mistakes
- Forgetting that radish is a brassica. Radishes sown as gap-fillers in every bed spread clubroot across the garden and reset the rest period where you need it most.
- Cover-cropping with mustard everywhere. White mustard is a brassica and can be heavily infected by clubroot. Choose phacelia or oats unless you know the soil is clean.
- Moving the crop but not the feeding. Compost follows the brassicas, not the bed. Fresh nutrients in the root bed give forked carrots and onions that never store.
- Rotating by crop instead of by family. Tomatoes after potatoes is not crop rotation at all – it is the same family twice running, with the same diseases.
- Keeping no records. The system survives two years in your head, three with a good memory. After that you are guessing with a spade in your hand.
- Expecting crop rotation to cure white rot. The sclerotia live at least fifteen years. Only keeping the disease out works – plus fresh soil if it is already in.
- Giving up because there are too few beds. Two split raised beds carry a four-group rotation. Half a system is not half bad – it is half the benefit.
- Including the perennials. Rhubarb, asparagus and herbs stay put. Draw them into the rotation and the plan becomes impossible to follow.
Frequently asked questions
How many years should a crop rotation be?
Four years is the standard and covers most crops and problems. Three years is the minimum that deserves the name. Brassicas need longer – six to seven years – because clubroot resting spores stay viable for a decade or more and have a half-life of roughly 3.6 years. Where aphanomyces root rot is present, legumes need six to eight years off.
Which vegetables should not follow each other?
Never two crops from the same family in consecutive years. The commonest slips are tomatoes after potatoes, radishes after cabbage, spinach after beetroot and leeks after garlic – all four are the same family on both sides. Also avoid root crops straight after a freshly manured bed, because carrots fork and onions store poorly.
What should I plant after potatoes?
Roots and onions are the best followers. Earthing up and lifting has loosened the soil to about 25 cm (10 in), and the dense haulm has kept annual weeds down – both of which suit carrots, parsnips and onions. Avoid tomatoes, peppers and aubergines after potatoes; same family, same diseases, including potato cyst nematode.
Can you rotate crops in raised beds?
Yes. Split each bed in half, so two beds give four squares and a full four-group rotation. Each square is small, but the rest period is correct and that is what counts. The alternatives are rotating in time with two or three families per season in the same square, or replacing the top 20 cm (8 in) of soil every three or four years.
What are the main vegetable plant families?
Nine will take you a long way: nightshades, brassicas, legumes, umbellifers, alliums, the goosefoot family, cucurbits, the daisy family and grasses. The usual surprises are that radish and rocket are brassicas, that spinach and beetroot belong together, that tomato and potato share a family, and that lettuce and sunchokes are both daisies.
Do you need crop rotation in a small garden?
Yes, but you can simplify. Rotate the three families responsible for almost every soil-borne problem – brassicas, alliums and nightshades – and place the rest wherever they fit. Lettuce, sweetcorn, squash and herbs can go anywhere. Half a rotation delivers most of the benefit and is far easier to sustain over the years.
Should you sow a cover crop every year?
Not necessarily across the whole plot, but every bed benefits from a green manure at least every third year. The easiest route is catch crops: sow oats or phacelia on ground that falls empty in July and August, after early potatoes or garlic. Avoid mustard and oilseed radish where clubroot is a risk – both are brassicas.
Which crops do not need rotating?
Perennials sit outside the system: rhubarb for 10–15 years, asparagus for 15–20, sunchokes and horseradish effectively forever, plus perennial herbs and soft fruit. Strawberries are in between and should move every three or four years. Sweetcorn, lettuce and salad leaves can go anywhere, because they carry few family-specific soil problems.
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