vegetable
brassica family

Brussels Sprouts

Brassica oleracea var. gemmifera

Brussels sprouts occupy ground for a long time — typically 6–8 months — but reward patient growers with harvests through the coldest months when little else is available. A touch of frost actually improves their flavour by converting starches to sugars. Sow seeds under cover in March or April and transplant to their final positions in May or June, spacing plants 60cm apart. These are big, hungry plants that need firm, fertile soil and consistent watering. Earth up the stems as they grow and stake tall plants to prevent wind rock. Start harvesting from the bottom of the stem upwards from October. Modern F1 varieties like 'Trafalgar' produce tight, sweet buttons that are a world away from the mushy school-dinner sprouts of memory. For Christmas dinner timing, sow in mid-March and choose a variety described as 'mid-season'.

Plan where to grow Brussels Sprouts using our vegetable garden planner.

SunlightFull sun
WateringModerate
Height90cm
Spacing60cm
Germination7–12 days
Sowing MethodUnder cover
Frost HardinessHardy
Sowing Depth1–2cm

When to Sow Brussels Sprouts

Sow brussels sprouts in March, April.

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Sowing months

Time to Harvest Brussels Sprouts

Expect to harvest approximately 8 months after sowing.

Companion Plants

Expected Yield

Each plant yields around 1–1.5kg of sprouts; 900g–1.3kg usable after trimming.

Common Problems with Brussels Sprouts

Caterpillars (cabbage white)

Both large and small cabbage white butterflies lay eggs on brassica leaves from May onwards, and the resulting caterpillars can strip plants bare within days. Cover plants with fine mesh netting (Enviromesh or similar) immediately after transplanting — this is far more reliable than checking for eggs. Inspect regularly and remove any caterpillars that get through.

Blown sprouts (loose buttons)

Open, leafy sprouts instead of tight buttons are usually caused by loose soil, wind rock, or insufficient firming at planting time. Transplant into firm ground, pressing the soil down hard around each plant. Earth up the stems as the plant grows and stake tall plants to prevent them rocking in the wind, which loosens the roots and disrupts growth.

Club root

A soil-borne disease that causes swollen, distorted roots and stunted, wilting growth in all brassicas. The spores persist in soil for up to 20 years. Lime acidic soils to raise the pH above 7.0 (club root thrives in acid conditions), rotate brassicas on a strict 3–4 year cycle, and start plants in modules with clean compost to give them a head start before the roots reach infected soil.

Plan your brussels sprouts in the allotment planner

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More Vegetables

Cherry Tomato

Solanum lycopersicum var. cerasiforme

vegetable

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.

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Beefsteak Tomato

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vegetable

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.

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Nantes Carrot

Daucus carota

vegetable

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.

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Butterhead Lettuce

Lactuca sativa

vegetable

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.

Part shadeHigh20cm