Crop rotation does not need to be complicated. On most allotments, the main job is simply to move the crop groups most likely to cause repeat problems rather than putting them back into the same soil year after year.
The simple 4-year plan below gives you a practical starting point that you can adapt to the beds and growing space you actually have.
The Simple 4-Year Allotment Crop Rotation Plan
If you want a simple place to start, use four main crop groups and move each one on by a bed each year.
| Bed | Year 1 |
|---|---|
| Bed 1 | Legumes |
| Bed 2 | Brassicas |
| Bed 3 | Potatoes / Tomatoes |
| Bed 4 | Roots & Alliums |
That gives you a clear 4-year allotment crop rotation without turning the whole plot into a puzzle.
What goes in each group
- Legumes: peas, broad beans, climbing beans
- Brassicas: cabbage, kale, broccoli, sprouts, cauliflower
- Potatoes / Tomatoes: potatoes and outdoor tomatoes
- Roots & Alliums: carrots, beetroot, parsnips, onions, garlic, leeks
Why This Rotation Order Works
This four-bed system is designed to be simple enough to follow rather than botanically perfect.
- Legumes first — a practical starting group for the cycle
- Brassicas next — these often fit well after peas and beans
- Potatoes / tomatoes — worth moving because repeat disease problems can build up
- Roots & alliums — grouped together here to create a workable fourth section
The grouping is deliberately practical. Potatoes and tomatoes are close enough in family and disease risk to treat as one rotation group, while roots and alliums share a section mainly to keep the system manageable.
If you remember one part of the sequence, make it this: brassicas usually fit well after legumes.
This is a framework, not a rulebook. Real allotments rarely have four perfect matching beds, so adapt the rotation to the space you actually have.
How the Rotation Moves Each Year
Once Year 1 is set, the rest becomes much easier. Move each crop group to the next position in the rotation each year.
| Year | Bed 1 | Bed 2 | Bed 3 | Bed 4 |
|---|---|---|---|---|
| Year 1 | Legumes | Brassicas | Potatoes / Tomatoes | Roots & Alliums |
| Year 2 | Brassicas | Potatoes / Tomatoes | Roots & Alliums | Legumes |
| Year 3 | Potatoes / Tomatoes | Roots & Alliums | Legumes | Brassicas |
| Year 4 | Roots & Alliums | Legumes | Brassicas | Potatoes / Tomatoes |
The Simple Rule
- Check what grew in each bed last year
- Move each main crop group to the next position in the rotation
- After Year 4, start the cycle again
What the Chart Shows
- Each bed grows every main crop group once during the four-year cycle
- The same crop family does not return to the same bed year after year
- Each bed gets a break before that crop group returns
- Once the first year is mapped, future years are much quicker to plan
Download the Free 4-Year Crop Rotation Planner
Want to map your own rotation without trying to remember what grew where?
I’ve created a simple A4 crop rotation planner you can print and keep in the allotment shed. Use it to record the main crop group in each bed or growing zone across four years, note permanent crops, and keep a few reminders for next season.
It is designed for real allotments rather than perfect four-bed layouts, with space for up to six beds or zones and plenty of room to make notes.
What Crops Need Rotating First?
Not every crop needs the same level of attention. If space is limited, prioritise the groups most likely to cause repeat problems when grown in the same soil year after year.
| Priority | Crop groups | Why |
|---|---|---|
| High | Potatoes / outdoor tomatoes | Blight, scab and repeat soil problems |
| High | Brassicas | Clubroot and repeat pest pressure |
| High | Alliums | Onion white rot risk and long persistence in soil |
| Medium | Squash, courgettes, pumpkins, sweetcorn, peppers | Heavier feeders, but more flexible |
| Low | Lettuce, herbs, radish, spinach, quick salads | Easy to fit around the main rotation |
If you can only rotate a few groups properly, concentrate first on potatoes and outdoor tomatoes, brassicas and alliums. More flexible crops such as salads, herbs and quick roots can usually be fitted around the main plan.
What This Looks Like on a Real Plot
On a mixed or awkward allotment:
- Move the potatoes/tomatoes first
- Decide where the brassicas will go
- Keep alliums out of the same patch where practical
- Use the remaining space for more flexible crops
The practical rule is simple: rotate the higher-risk groups first and keep the rest flexible.
Why Rotation Matters: Disease, Pests and Soil Pressure
Crop rotation is not about making the plot look tidy. Its main purpose is to stop the same problems building up in the same patch of soil year after year.
Rotation can help reduce:
- Disease build-up within the same crop family
- Repeat pest pressure on the same bed
- Repeated soil pressure from growing similar crops in one place too often
The principle is simple: moving the main crop groups spreads the risk around the plot.
You do not need to rotate every crop perfectly. Concentrate on avoiding obvious repeats with the higher-risk groups, then keep the rest of the plan flexible.
Rotation Vs Feeding The Soil
Crop rotation helps, but it is not the whole story. A lot of what gets blamed on rotation is really a soil-feeding issue.
What good soil care does
- puts nutrients back into the bed
- improves soil structure
- helps the ground hold moisture
- keeps beds easier to work year after year
If you are adding compost, mulch, rotted manure, leaf mould, or other organic matter regularly, you are already doing a big part of what keeps an allotment productive. That is why many growers can be fairly relaxed with lower-risk crops without the whole plot suddenly going downhill.
What rotation will not fix on its own
- hungry soil
- dry, tired beds
- low organic matter
- poor fertility caused by not feeding the ground properly
If a bed is worn out because it has not been fed well, simply moving the crops around will not solve that on its own. Rotation helps spread pressure across the plot, but it does not replace the basic job of looking after the soil.
Good soil care keeps the allotment productive; rotation helps prevent the same crop-family problems building up repeatedly in one place.
How To Make Crop Rotation Work On A Real Allotment
Most allotments are not four neat, matching beds. That is normal. Use rotation as a guide, not a rigid diagram.
What real plots usually look like
- uneven beds or one long mixed bed
- fixed areas such as strawberries, rhubarb, asparagus, herbs, and fruit bushes
- a brassica cage that stays put for practical reasons
- quick crops tucked into gaps around the main planting
A real plot might have a fruit bed that never moves, a netted brassica bed that stays where the frame already is, and one long bed that gets split between onions at one end and beetroot at the other. That is still workable. Crop rotation does not only work on tidy demonstration plots.
Where you can stay flexible
- Lettuce, radish, herbs, and quick salads can fill spare spaces
- Mixed beds are fine if the main crop group is still clear
- Long or awkward beds can be split into zones instead of treated as one block
For example, one half of a long bed might count as the brassica area this year, while the other half takes legumes or roots. Next year, you move the main group along, even if the bed itself stays in the same place.
In practice, that usually means rotating the main crop groups around fixed features, not worrying about every filler crop, and aiming to avoid obvious repeats rather than create a perfect diagram. On most allotments, the job is not to make the plan look neat on paper. It is to stop the main repeat-problem crops landing back in the same patch while still making the plot usable.
That same approach becomes even more useful when space is tight.
Crop Rotation For Small Allotments And Raised Beds
Small plots make rotation tighter, but the same logic still holds: keep the main problem crop groups moving where you can.
If you only have 2 or 3 beds
- Do not force a tidy 4-bed system onto a space that will not take it
- Prioritise potatoes and outdoor tomatoes, brassicas, and alliums
- Fit lower-risk crops around them afterwards
If those high-risk groups are moving, you are already doing the part that matters most.
Use sections, not just whole beds
- Split a bed into zones if needed
- Move the main crop group to a different section next year
- Treat each zone as part of the rotation
That works well for raised beds, awkward plots, and long narrow spaces where a full bed-by-bed plan does not really fit.
A small setup might be two raised beds and a few containers, or three narrow beds with one split in half. In that kind of space, the goal is not to make the plan look perfect. It is to stop the same high-risk crop groups landing back in exactly the same patch.
When a 3-year rotation makes sense
A 3-year rotation is often more realistic on smaller plots. It is not as roomy as a 4-year plan, but it still helps you avoid the obvious repeats with the crops that matter most.
If space is really limited, it is usually better to follow a simple 3-part plan properly than force a 4-year rotation that becomes too awkward to stick to.
In a small plot, avoiding obvious repeats matters more than forcing the space into a perfect four-year system.
When It Is OK To Break The Plan
No rotation plan survives a real season perfectly. Beds stay occupied longer than expected, one crop takes over more space, or you end up working around something fixed. That does not make the plan useless. It just means you keep the priorities straight.
Common reasons it slips
- you inherit a plot and do not know what was grown there before
- one bed is tied up by a fixed crop or structure
- you need more room for one crop this season
- the layout does not give every group a neat move
Most people hit one of these sooner or later. The point is not to abandon the plan the moment it gets awkward.
How to handle a compromise
- move what you can
- avoid the most obvious repeats
- keep lower-risk crops flexible
- add compost or organic matter if a bed is reused sooner than planned
For example, if you need extra potato space one year, it is better to make one deliberate compromise than throw the whole rotation out and start planting by guesswork.
Make a rough note of what changed. It does not need to be fancy. Even a basic record makes it much easier to get the rotation back on track next year.
A workable plan with a couple of compromises is still far better than planting blind and repeating the same crop families in the same ground year after year.
Using The Allotment Planner To Track Rotation
The theory is the easy bit. The part people trip over is remembering what was where once a new season starts.
Why the planner helps
- Map your beds/zones.
- Add the main crop groups.
- Save the year.
- Duplicate/update it for next year.
FAQs
Yes, but keep it simple. Move potatoes and outdoor tomatoes, brassicas, and alliums where you can, then fit the rest around them.
Start with potatoes and outdoor tomatoes, brassicas, and alliums. Those are the groups most likely to cause repeat problems.
Best avoided, especially outdoors. They are close enough in family and disease risk to treat as one rotation group.
Yes. Brassicas after legumes is one of the classic moves in a simple crop rotation.
Yes, if possible. Alliums are worth moving because their problems can linger in the soil.
No. Compost helps fertility and soil health, but it does not replace rotation where disease and pest pressure are concerned.
Avoid obvious repeats with potatoes, brassicas, and alliums, then start keeping a simple record from now on.
A 4-year plan is ideal if you have the space. A 3-year plan is often more realistic on smaller plots.
Usually, yes. They are much more flexible than the main rotation groups.
Conclusion
Crop rotation works best when it stays simple. Keep a record of what grew where, move the main problem-prone crop groups where practical, and adapt the plan to the beds you actually have.
You do not need a perfect four-year diagram to benefit from rotation. A simple system you can follow year after year is far more useful than a complicated one you abandon.
