Leek
Allium ampeloprasum
Leeks are one of the most valuable winter allotment crops, standing in the ground from October through to April and shrugging off frost, snow, and everything British weather throws at them. They have a subtle, sweet onion flavour and silky texture when cooked. Sow seeds thinly under cover in March, then transplant in June when the seedlings are pencil-thick. The traditional planting method is to make holes 15cm deep with a dibber, drop a seedling in, and simply water — don't fill the hole with soil. As the leek grows, the blanched white stem develops naturally. For longer white stems, earth up around the plants as they grow. 'Musselburgh' is the classic hardy variety; 'King Richard' is an early type ready from September. Leeks have few pest problems, though leek moth is increasing in parts of the UK — fine mesh provides protection.
When to Sow Leek
Sow leek in March, April.
Time to Harvest Leek
Expect to harvest approximately 7 months after sowing.
Companion Plants
Expected Yield
Each plant produces one leek; expect 3–4kg per metre of row.
Common Problems with Leek
Leek rust
Orange pustules appear on the leaves, typically in warm, humid conditions from late summer onwards. While unsightly, leek rust rarely affects the usable white stem beneath. Remove the worst-affected outer leaves, improve air circulation by spacing plants generously, and avoid high-nitrogen feeds which produce soft, susceptible growth. Most leeks are still perfectly edible despite some rust damage.
Leek moth
Small caterpillars bore into the stems and leaves, creating tunnels that allow secondary infections to enter. Leek moth has two generations per year (May–June and September–October). Cover plants with fine insect-proof mesh during these peak risk periods. Check stems regularly for entry holes and frass (droppings), and remove any severely damaged plants.
Allium leaf miner
A relatively new pest in the UK whose larvae mine through leaves and into the stem, causing distorted growth and creating entry points for bacterial rot. Cover with fine mesh during the two main egg-laying periods: March–April and October–November. There are no approved chemical controls — physical barriers are the only reliable protection.
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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.