How to Grow Cauliflower

Overview

Cauliflower is considered one of the more challenging brassicas to grow, but the reward of a homegrown, snow-white curd is well worth the effort. It needs steady, uninterrupted growth and is sensitive to temperature extremes. Choose your variety carefully to match your harvest season.

Health Benefits

Good source of Vitamin C: Cauliflower provides a useful amount of Vitamin C, supporting immune function and acting as an antioxidant.

Choline for brain health: One of the few vegetables that contains meaningful amounts of choline, a nutrient important for brain development, memory, and liver function.

Fibre and sulforaphane: Rich in fibre for digestive health and contains sulforaphane, a compound being studied for its potential health benefits. Cauliflower is also a popular versatile low-carb substitute in cooking.

Soil Preparation

Cauliflowers demand rich, deeply dug soil with excellent moisture retention and a pH of 6.5 to 7.5. Dig in generous amounts of well-rotted compost or manure well in advance of planting. Firm the soil thoroughly, as loose soil leads to poor root anchorage. Lime acidic soils in the preceding autumn.

Sowing & Planting

Sow summer varieties indoors from January to March and transplant from April to May. Autumn types are sown in April and planted out in June. Sow in modules to minimise root disturbance at transplanting. Space plants 60cm apart in rows 60cm apart. Water in well and firm the soil around the stem.

Care & Maintenance

Water consistently and generously, as any check to growth can cause small, premature curds. Feed with a balanced fertiliser every two weeks during the growing season. When the curd begins to form, bend the inner leaves over it to protect the white colour from sun and rain. This process is called blanching.

Harvesting

Cut cauliflower heads when the curds are firm, white, and tightly packed, before the florets begin to separate. Use a sharp knife to cut below the head, including a few wrapper leaves for protection. Summer varieties are ready from June to September, and autumn types from October onwards.

Common Problems

Buttoning produces tiny, premature curds due to stress from transplant shock, drought, or temperature extremes. Ensure steady growth and consistent watering.

Club root is a persistent problem in acidic soil. Maintain pH above 7.0 and practise strict crop rotation.

Caterpillars from cabbage white butterflies can damage leaves and curds. Net plants and remove caterpillars by hand.

Companion Planting

Cauliflower grows well near celery and beans, which provide beneficial shade and nutrients. Avoid planting near strawberries and tomatoes, as these can attract pests harmful to brassicas.