Potatoes are often the first major crop grown on an allotment. They’re reliable, productive, and great at clearing ground. But once they’re harvested, many allotment holders are left staring at an empty bed wondering what should go in next.
What you plant after potatoes matters more than most people realise. Potatoes are heavy feeders, they disturb the soil, and they leave beds in a very particular condition. Choose the wrong follow-on crop and growth can stall. Choose the right one and the bed recovers quickly and stays productive.
This guide explains what to plant after potatoes on a UK allotment, why those crops work, and how to fit them into a sensible crop rotation.
Why potatoes affect the next crop so much
Potatoes do a few important things to the soil.
They:
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use a lot of nutrients
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break up and loosen the soil
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suppress weeds effectively
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leave ground relatively free of competition
By the time potatoes are lifted, the soil is usually workable, open, and fairly clean — but also nutrient depleted.
That combination is what determines what should come next.
The best crops to plant after potatoes
The most reliable crops to follow potatoes are those that either:
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improve soil fertility, or
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don’t demand rich soil straight away
Legumes are the best follow-on crop
If you only remember one rule, remember this: legumes are ideal after potatoes.
Crops such as peas and beans actively improve soil by fixing nitrogen, helping to rebuild fertility after a heavy-feeding crop. They also cope well with soil that’s been recently disturbed.
Good options include:
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peas
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broad beans
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French beans
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runner beans
These crops help reset the balance in the bed rather than stripping it further.
Brassicas also work well after potatoes
Brassicas are another strong choice, particularly if the bed was well manured before the potatoes were planted.
Because potatoes loosen the soil and suppress weeds, brassicas often establish well in the following season — provided nutrients are topped up.
Suitable brassicas include:
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cabbage
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kale
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broccoli
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cauliflower
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Brussels sprouts
If brassicas are your next crop, adding compost or well-rotted manure before planting is usually worthwhile.
Fast crops for the same season
If you harvest early potatoes in summer, you don’t have to leave the bed empty until next year.
Quick-growing crops that can follow potatoes in the same season include:
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lettuce
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spinach
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radishes
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turnips
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beetroot
These crops take advantage of cleared ground without demanding high nutrient levels, making them ideal gap-fillers.
Crops to avoid planting straight after potatoes
Some vegetables struggle if planted immediately after potatoes, particularly if the soil hasn’t had time to recover.
Avoid roots as a direct follow-on
Root crops such as carrots and parsnips often perform poorly after potatoes. The soil can be too loose and uneven, leading to forked or misshapen roots.
If you want to grow roots, it’s usually better to wait a season or choose a different bed.
Avoid planting potatoes again
Planting potatoes in the same bed year after year dramatically increases the risk of:
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disease build-up
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poor yields
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soil exhaustion
Even if the crop looks fine initially, problems tend to surface over time.
How this fits into crop rotation
In most allotment rotation systems, potatoes are treated as a group of their own.
A simple and effective sequence is:
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Potatoes
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Legumes
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Brassicas
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Roots
This rotation:
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balances nutrient use
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reduces pest and disease pressure
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keeps soil structure healthy
If you’re running a 3-year rotation rather than four, potatoes are often grouped with other heavy feeders and followed by legumes.
What if you’re short on space?
On smaller allotments, rotation can feel restrictive.
If space is limited:
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prioritise rotating crop families rather than individual crops
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avoid growing potatoes in the same bed two years running
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use fast crops to keep beds productive without overthinking it
Even partial rotation is better than none.
Common mistakes after harvesting potatoes
Most issues come from rushing the next planting decision.
Common mistakes include:
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planting another heavy feeder immediately
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ignoring soil condition after lifting
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leaving beds empty too long
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forgetting where potatoes were grown the previous year
The solution isn’t complexity — it’s planning.
Planning what comes after potatoes
Remembering what was planted where becomes difficult surprisingly quickly, especially once beds are reused and crops overlap.
Being able to see:
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where potatoes were grown
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what follows them
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how beds change year to year
makes rotation far easier to stick to long term. Visual planning removes guesswork and prevents accidental repetition.
Final thoughts
Potatoes are generous crops, but they take a lot from the soil. What you plant after them determines how quickly the bed recovers and how productive it stays.
Follow potatoes with legumes or brassicas, avoid repeating heavy feeders, and use fast crops to keep space working for you. Get that right and your allotment will feel far easier to manage year after year.