Cauliflower

Demanding but deeply satisfying. Cauliflower needs consistent moisture, good soil and careful timing: get those right and a home-grown head is far superior to anything bought in a shop.

Written by Yemi · Last reviewed August 2026

Maturing this month

First sprouts in 5–10 days

Difficulty

Cauliflower should be ready to harvest this month. Check for size and colour.

Growing Calendar

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sow

Transplant

Harvest

This month: Sep

Log to journal

Ready to harvest now

•Check size and ripeness
•Harvest regularly
•Store or use fresh

Sowing Guide

What you'd find on the seed packet

Sow Depth

1cm

Spacing

50–60cm

Germination

5–10days

Thinning

One plant per module; transplant to final spacing when 3–4 true leaves have formed

Grower's Note

Cauliflower dislikes root disturbance: sow in modules and transplant carefully. Consistent moisture is critical throughout the growing season; drought stress causes small, poor-quality heads.

Recommended Varieties

'Clapton' holds an RHS Award of Garden Merit and carries genuine resistance to club root, a real advantage if that's been a problem on your plot. 'Jerome' also holds an AGM and copes well with cold, producing good white heads from an early spring sowing when other varieties would struggle. For organic growing, The Organic Gardening Catalogue lists 'Neckarperle' as an open-pollinated German heirloom alternative, producing dense white curds from spring or summer sowings.

Planting Out Guide

Best spaces, conditions and how to plant out

Plant Spacing

60–75cm

Best Grown In

Open ground, large raised beds

Conditions

Full sun. Firm, fertile, slightly alkaline soil. Add lime if acidic. Needs consistent moisture throughout.

Grower's Note

Tie leaves over developing curds to protect from sunlight and frost, which can discolour the head. Net against cabbage white butterflies.

Growing Stages

Approximate weeks from sowing to harvest

Sprouting

1wks

Seeds germinate and first leaves emerge. Keep warm and moist.

Establishing

6wks

Root system develops and plant builds structure. Pot on if needed.

Maturing

16wks

Plant reaches full size and begins producing. Harvest at peak.

Total~23 weeksfrom seed to harvest

Companion Plants

Plant these nearby for natural pest control, better yields, and healthier soil.

Nasturtium

Repels Pests

Nasturtium acts as a sacrificial trap crop, drawing aphids and cabbage white caterpillars away from your Cauliflower.

Marigold

Repels Pests

Marigold's strong scent confuses pest insects, and its roots help suppress soil nematodes that trouble Cauliflower.

Thyme

Repels Pests

Thyme's strong scent helps confuse cabbage moth and other pests searching for Cauliflower.

Chives

Repels Pests

Chives' oniony scent masks the smell pests use to find Cauliflower, and can help reduce fungal spotting too.

Onion

Repels Pests

Onion's sulphur scent masks the smell carrot fly and other pests use to home in on Cauliflower.

Climate Control

Today

—C

Humidity

—%

Water

Every 2–3 days

Sunlight

6+ hours direct sun

Watch Out For

Cabbage white caterpillars strip leaves: check undersides weekly from late spring and remove egg clusters and caterpillars by hand or net plants early

Clubroot distorts and kills roots in acidic soil: test pH before planting and lime to above 7 if growing on susceptible ground

Heads quickly deteriorate once ready: check every few days at maturity and harvest as soon as the curd is firm and compact; delay causes 'ricey' texture and splitting

Pests & Problems

Full guide

Cabbage White Butterfly

Yellow egg clusters on leaf undersides

Apr–Oct

Clubroot

Wilting in warm weather despite watering

May–Oct

Cabbage Root Fly

Wilting transplants

Apr–Sep

What You'll Need

Equipment for growing cauliflower

Modular Seed Tray

96-cell for precision sowing

Fine Rose Watering Can

Gentle shower for seedlings

Bamboo Canes

Pack of 20 × 120cm

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Grown Organically

Every method in this guide works with natural systems: no synthetic chemicals, no shortcuts.

Read our approach

Common Questions

About growing Cauliflower in the UK

Why is my cauliflower not forming a curd?

Curds fail to form properly due to temperature fluctuations, nitrogen deficiency, or irregular watering causing plant stress. Cauliflower needs consistent growing conditions: firm, fertile soil, regular watering, and protection from frost and extreme heat.

Why is my cauliflower curd yellow or brown?

Yellowing is caused by sun exposure. Tie the outer leaves loosely over the developing curd to protect it. Browning can indicate over-maturity (harvest promptly once the curd is full and tight) or frost damage.

When should I harvest cauliflower?

Harvest when the curd is compact, white (or purple/green for coloured varieties), and about 15–20cm across. Once the surface becomes grainy and sections begin to separate, the cauliflower is past its best. Act promptly: the harvest window is short.

Is cauliflower difficult to grow?

Cauliflower is one of the more demanding brassicas: it is sensitive to temperature extremes, needs consistent moisture and fertility, and has a long growing season. Broccoli and kale are more forgiving alternatives for beginners.

Written from real growing experience, not just research. Read the story behind Pelham Gardens.

Member guides

There's more to growing Cauliflower than this guide covers.

A Garden Journal to log what worked, a personalised sowing planner in My Garden, and monthly reminders timed to the calendar.

See what's included