Crop Rotation Basics
Crop rotation means moving vegetable families around the garden or allotment each year instead of growing the same crops in the same place. It helps organise feeding, spreads workload and can reduce the build-up of some pests and soil-borne problems. A simple three or four-year plan is more useful than a complicated system you cannot maintain.
Begin by sketching your growing area, including raised beds, permanent paths and containers. Divide annual vegetable ground into three or four manageable sections of similar size where possible. Then list last year's crops, not just the individual varieties. The main UK groups are brassicas, legumes such as peas and beans, onions and other alliums, roots, and potatoes. Some gardeners combine roots and onions in a four-year plan, while others use a five-group record where space allows. Perennial crops, herbs, rhubarb and asparagus usually stay put and sit outside the rotation. If you have only two beds, rotate as well as you can and focus on compost, hygiene and not repeating the same crop family unnecessarily.
A practical four-year cycle can place potatoes first, followed by brassicas, then legumes, then roots and alliums together. The following year, move each group one bed forward. Potatoes and brassicas appreciate fertile soil, so they often follow a generous application of garden compost or well-rotted manure. Legumes need less feeding and can leave soil in good condition for the next crop. Roots and alliums prefer soil that was enriched previously rather than freshly manured, which can encourage forked roots or excessive leaf growth. There is no single perfect sequence for every plot. The key is recording it clearly and avoiding consecutive years of close relatives in the same ground whenever feasible.
Plan crops within their family rather than by their appearance. Cabbage, kale, sprouts, cauliflower, broccoli, pak choi and radish are brassicas, so avoid following one with another in the same bed. Peas, broad beans, French beans and runner beans belong with legumes. Garlic, onions, leeks, shallots and spring onions are alliums. Carrots, parsnips, beetroot and swede can sit in the roots section for a simple plan, although individual needs differ. Potatoes are kept as their own group because they are hungry and commonly need a separate space. Keep seed labels and a notebook, since memory becomes unreliable once crops have been cleared and beds mulched in autumn.
Use rotation alongside sensible soil care, not as a substitute for it. Add garden compost according to the next crop's needs, keep beds weeded and remove diseased leaves or old crop debris promptly. Do not move problems around the plot on dirty tools, infected plant material or uncleaned pots. If a crop suffered badly, note the issue and consider giving that family a longer break from the bed where practical. Avoid placing brassicas immediately after brassicas even if you have added compost, and do not repeatedly plant potatoes in the same soil. Good spacing, netting where needed and steady watering also matter. Rotation reduces pressure; it cannot guarantee that every pest or disease disappears.
Make the plan flexible enough for real gardening. Early salads, radishes and quick spring onions can be fitted before or after a main crop without disrupting the whole rotation. Green manures and a winter mulch of compost can occupy empty ground between crops. If a bed becomes free unexpectedly, use it for a quick leafy crop rather than leaving bare soil, then record the change. Crops in containers can be treated separately, though it is still wise to refresh compost and avoid repeating tomatoes or potatoes in the same compost. At an allotment, coordinate only your own plot, not your neighbour's. Your rotation should suit your soil, shade, storage space and the vegetables your household genuinely eats.
Review the plan every winter. Copy the bed map into next year's notebook and move each group before you order seed. Label beds in spring so helpers do not accidentally put the wrong family into a space. If you inherit a new garden or allotment with no records, start fresh: avoid growing the same family in the same area for several years, improve soil with compost and build your own history. Do not abandon rotation because beds are uneven or crops failed. A partly followed plan is still useful. After a few seasons, your notes will show which beds are dry, fertile or shaded and allow you to adapt the sequence confidently.
Frequently asked questions
Do I need crop rotation in a small garden?
Yes, although it can be simple. Even two beds benefit from alternating crop families and avoiding repeated potatoes, brassicas or alliums in the same soil. Keep notes, add compost thoughtfully and use containers for some crops. Small-space rotation reduces repeated pressure while remaining practical for the vegetables you most want to grow.
What follows potatoes in a crop rotation?
In a common four-year plan, brassicas follow potatoes because the ground has been well prepared and remains fertile. Add compost according to the needs of the incoming crop, rather than automatically adding more. The sequence can vary with your soil and space, but avoid following potatoes with more potatoes whenever possible.
Can I grow a catch crop outside the rotation?
Yes. Fast crops such as salad leaves, radishes and spring onions can fill gaps before or after a main crop. Record them, but do not let them make the plan needlessly complicated. The main aim is to avoid repeated major crop families in one bed and keep soil covered productively.
General guidance for UK home gardens and allotments. Conditions vary by region, soil and season; the RHS or a local garden centre can give site-specific advice. Page updated 18 Sep 2026.