When should I sow cauliflower in the UK?

Sowing times depend on the type you are growing. Summer cauliflowers sow indoors from January to March, then transplant outdoors in April or May. Autumn varieties sow from March to May and crop from September to November. Overwintering types sow in May or June for a harvest the following spring. Check the seed packet for the specific variety, as timing varies by a few weeks between cultivars.

Why are my cauliflower heads so small?

Small heads are caused by buttoning. This happens when the plant receives a check in growth, such as drought, cold shock, root disturbance, or nutrient deficiency. The plant panics and produces a tiny premature curd instead of growing to full size first. Consistent watering, firm planting, and avoiding transplant shock are the best preventions. Never let seedlings become root-bound in modules.

What is the best cauliflower variety for beginners?

All Year Round is the most forgiving variety. It tolerates a wider range of sowing dates and growing conditions than most cauliflowers. It produces reliable medium-sized white curds from spring through to autumn. Clapton F1 is the best choice if your soil has a history of clubroot, as it carries genetic resistance to the disease.

How do I blanch cauliflower curds?

Fold the large outer leaves over the developing curd and secure them. This blocks sunlight and keeps the curd white. Start blanching when the curd reaches roughly 5-7cm across. Check every few days, as the curd grows quickly once it begins to form. Coloured varieties like Graffiti purple and Romanesco do not need blanching.

Can I grow cauliflower in containers?

Yes, but results are less reliable than in open ground. Use a pot at least 45cm wide and 40cm deep, filled with rich compost. Water daily in warm weather, as any drought causes buttoning. Feed fortnightly with a high-nitrogen liquid fertiliser. Choose compact varieties like Snowball or Igloo. Most gardeners find open ground or raised beds give better results.

How do I prevent clubroot in cauliflower?

Clubroot is a soil-borne disease that persists for 20 years or more. Grow the resistant variety Clapton F1 on infected ground. Raise the soil pH to 7.0-7.5 with garden lime, as the pathogen thrives in acidic conditions. Start seedlings in clean compost and transplant with a large root ball. Rotate brassicas on a minimum four-year cycle and never compost infected roots.

When should I harvest cauliflower?

Harvest when the curd is firm, tight, and compact. The surface should look smooth and dense with no gaps between florets. Once the florets start to separate and open, the quality drops rapidly. Cut the head with a sharp knife, leaving a few wrapper leaves attached to protect the curd. Most varieties give a harvest window of just 7-10 days once the curd is ready.

Growing | 11 October 2025 | 16 min read

How to Grow Cauliflower in the UK

Complete guide to growing cauliflower in UK gardens. Covers varieties, sowing times, soil prep, blanching curds, clubroot prevention, and harvesting.

Large white cauliflower head with green leaves in a vegetable garden

Growing

Cauliflower is the most demanding brassica for UK growers, requiring rich firm soil, consistent moisture, and careful timing. Summer varieties like Snowball sow indoors from January to March for June harvests. Autumn types crop from September to November. Overwintering varieties planted in June produce heads the following April. Clubroot-resistant Clapton F1 is essential on infected ground. Any check in growth from drought or poor soil causes buttoning, where heads form prematurely at just 2-5cm across.

Soil pH6.5-7.5, rich and firm

Summer SowingIndoors January to March

Clubroot ResistantClapton F1 variety

Curd Weight700g-1.2kg when well grown

Key takeaways

Cauliflower needs rich, firm soil with a pH of 6.5-7.5 and consistent watering to prevent buttoning
Summer varieties sow indoors from January to March, autumn types from March to May, and overwintering types in May to June
Clapton F1 is the only widely available clubroot-resistant variety and essential on infected plots
Blanch white curds by folding outer leaves over the head to block sunlight and prevent yellowing
Harvest when the curd is tight and compact, before individual florets begin to separate and open
Any interruption to steady growth causes buttoning, so never let plants dry out or become root-bound in modules

cauliflower vegetables grow your own brassicas allotment clubroot overwintering

By Garden UK Editorial Team

Our team produces practical UK gardening guidance from source research, contributor records and established horticultural practice. Editorial standards are overseen by Matt W.

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