Celery
Apium graveolens
Celery demands more attention than most vegetables but delivers crisp, flavourful stalks that bear no resemblance to supermarket celery. It needs rich, moisture-retentive soil and consistent watering throughout the growing season — any drought stress results in tough, stringy stalks. Start seeds very early (February–March) in gentle warmth, as germination is slow. Don't cover the seeds — they need light to germinate. Transplant in May after hardening off, spacing 30cm apart. Self-blanching varieties like 'Golden Self-Blanching' are easier than trench celery and produce perfectly usable stems. For white stems, plant in a block (rather than rows) so the outer plants shade the inner ones. Feed fortnightly with a balanced liquid fertiliser. Celery is in the same family as parsley and coriander, and its leaves are just as useful as a herb in soups and stews.
Plan where to grow Celery using our vegetable garden planner.
When to Sow Celery
Sow celery in March, April.
Time to Harvest Celery
Expect to harvest approximately 5 months after sowing.
Companion Plants
Expected Yield
Each plant produces one head of around 300–500g usable stalks.
Common Problems with Celery
Bolting
Celery bolts when exposed to temperatures below 10°C for extended periods, especially if transplanted too early before the soil has warmed up. Harden off seedlings gradually over 7–10 days and don't plant out until late May at the earliest. Keeping the soil consistently moist also reduces stress-induced bolting — any drought significantly increases the risk.
Celery leaf miner
Pale brown blisters appear on the leaves where tiny larvae are tunnelling between the upper and lower leaf surfaces, reducing the plant's ability to photosynthesise and weakening growth. Remove and destroy affected leaves as soon as you spot them to break the lifecycle. Cover plants with horticultural fleece from May onwards as a physical barrier against the adult flies laying eggs.
Stringy stalks
Stringy celery stalks are usually caused by inconsistent watering or plants left too long before harvest. Keep soil evenly moist throughout the entire growing season — any period of drought, even brief, causes tough fibrous tissue to develop in the stems. Harvest before stalks become thick and woody, and use self-blanching varieties which tend to produce more tender stems.
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Cherry Tomato
Solanum lycopersicum var. cerasiforme
Cherry tomatoes are one of the most rewarding crops for UK allotment growers. These small, sweet fruits ripen reliably even in cooler summers, producing heavy trusses from July right through to October. They thrive in grow bags, pots, or directly in the ground, making them versatile for any plot size. Pinch out side shoots regularly on cordon varieties to channel energy into fruit production. Bush varieties like 'Tumbling Tom' need no training and work brilliantly in hanging baskets. Feed weekly with a high-potash tomato feed once the first fruits set. The key to great flavour is letting them ripen fully on the vine rather than picking early.
Beefsteak Tomato
Solanum lycopersicum
Beefsteak tomatoes produce the large, meaty fruits that are perfect for slicing into sandwiches and burgers. They need a long growing season in the UK, so starting seeds early under cover is essential. These are almost always grown as cordons — train them up a single stem, removing side shoots weekly. Each truss produces fewer but much larger fruits than cherry types, often weighing 200–500g each. They benefit from greenhouse growing in cooler regions, though sheltered outdoor spots in the south can produce good results. Consistent watering is critical; irregular watering causes blossom end rot and fruit splitting. Stop the plant at 4–5 trusses to ensure fruits ripen before autumn.
Nantes Carrot
Daucus carota
Nantes carrots are the gold standard for flavour — sweet, crisp, and cylindrical with a smooth skin that barely needs peeling. They perform well in most UK soils but prefer light, stone-free ground to grow straight. If your soil is heavy clay, grow them in raised beds or deep containers filled with sandy compost. Sow thinly to avoid the need for heavy thinning, which attracts carrot fly. Cover rows with fine mesh or enviromesh as a physical barrier against carrot fly — this is far more reliable than companion planting alone. Successional sowing from March to July gives you carrots from June through to winter. Late sowings can be left in the ground over winter under a thick mulch of straw.
Butterhead Lettuce
Lactuca sativa
Butterhead lettuce produces soft, rounded heads with tender, buttery-textured leaves that melt in the mouth. It's one of the quickest salad crops to grow — ready in as little as 8 weeks from sowing. Unlike iceberg types, butterheads tolerate partial shade and are less likely to bolt in warm spells. Sow small batches every 2–3 weeks from March to September for a continuous supply. They work well as an intercrop between slower-growing vegetables like brassicas and leeks. Water consistently but avoid wetting the leaves to reduce the risk of grey mould. 'All the Year Round' is the classic UK variety and lives up to its name, performing well in almost every season.