Cauliflower

01 About

The most demanding of the brassicas, but a perfect white curd cut fresh from the garden is one of the great vegetable triumphs. Cauliflower demands consistency — steady moisture, firm soil, and no growth checks — but rewards that attention with a spectacular harvest. Modern varieties extend the season from June through to November, and coloured types including orange Cheddar, purple Graffiti, and lime-green Romanesco have transformed this classic vegetable into one of the most striking crops on the plot.

02 What to Grow

Standard white cauliflowers are the classic choice — summer types like Snowball mature in 12–16 weeks, autumn types like All Year Round give larger heads from August to November. Coloured varieties are increasingly popular: Cheddar produces vivid orange curds rich in beta-carotene; Graffiti and Violetta are striking purple; Romanesco produces extraordinary lime-green fractal spirals with a nutty flavour unlike any other brassica. All benefit from the same careful growing method — it is the attention to detail that differs, not the technique.

03 Varieties

The number of varieties shown for each crop is based on UK consumption data (2025/26) — the more popular the crop, the more variety choices we include.

⬜ White Cauliflowers

The classic choice. Summer and autumn types give a long harvest season from June to November.

All Year Round

White

Most reliable all-purpose white cauliflower for UK conditions. Medium-sized firm curds from summer through to autumn. Compact enough for smaller plots.

• Reliable
• Beginners

Snowball

White

Classic compact summer type ready in 12–14 weeks from transplanting. Small, tight, pure white curds. One of the best for smaller gardens.

• Compact
• Beginners

Aalsmeer

White

Reliable autumn cauliflower producing large, firm, very white heads from August to October. Strong outer leaves protect the curd from weather.

• AGM
• Reliable
• Large Head

🌈 Coloured Cauliflowers

Orange, purple, and green varieties with striking appearance and distinctive flavour. Grown exactly like white types.

Romanesco

Green

Extraordinary lime-green spiral fractal heads. Nutty, sweet flavour unlike any other brassica. Slightly more demanding — needs a long warm season. Worth every effort.

• ⭐ Flavour
• Spectacular

Graffiti F1

Purple

Vivid purple heads that retain colour when lightly cooked. Milder and sweeter than white types. Very reliable — one of the easiest coloured cauliflowers to grow well.

• AGM
• ⭐ Flavour
• Reliable

Cheddar F1

Orange

Bright orange curds rich in beta-carotene. Mild, slightly sweet flavour. Colour deepens on cooking. One of the most visually striking vegetables in the kitchen garden.

• ⭐ Flavour
• Spectacular

04 Where to Source

Cauliflower seed is available from all main online seed companies. The widest range of coloured varieties is found online — garden centres typically stock white types only. Plug plants appear in garden centres from March and market stalls from April. Buying plugs saves the most difficult early stage and is a very good option for a first attempt at this crop.

05 Planting Options

🌱 From Modules (Recommended)

Always sow cauliflower in individual modules — root disturbance at transplanting causes an immediate growth check that can ruin curd quality. Sow one seed per module at 1cm depth. Germinate at 10–18°C in a cold frame or on a cool windowsill. Transplant carefully when plants have 4–5 true leaves. Firm in very well and water immediately.

Suitable varieties: All varieties.

🛒 From Plug Plants

Garden centres sell cauliflower plug plants from March. Buying plugs bypasses the most difficult early stage and is an excellent option for a first attempt. Choose compact, sturdy plugs — not tall and drawn. Plant out immediately, firm in very well, and water thoroughly. Plugs establish quickly if planted carefully.

Suitable varieties: All varieties. Particularly recommended for beginners.

06 Companion Planting

✅ Grow nearby

• 

  🌸 Nasturtiums

  Nasturtiums attract aphids away from brassicas, acting as a sacrificial trap crop. Plant at the bed edges and they draw blackfly away from cauliflower.

• 

  🌿 Dill

  Dill attracts beneficial predatory insects that prey on caterpillars and aphids — two of the main cauliflower pests. Plant at the margins of the brassica bed.

• 

  🥬 Celery

  Celery is said to repel the white cabbage butterfly. Interplanting celery around brassicas is a traditional kitchen garden pest-deterrent combination.

❌ Keep apart

• 🍅 Tomatoes — Nightshades and brassicas compete strongly for nutrients — especially calcium. Keep in separate beds and rotate annually.
• 🌿 Fennel — Fennel is allelopathic to most vegetables. Keep well away from all brassica crops.
• 🍓 Strawberries — Both attract similar soil pests and can suppress each other when grown in close proximity.

07 Sowing — How To

Cauliflower is sensitive to root disturbance — always sow in modules rather than a seedbed, and transplant carefully before plants become pot-bound. Cool germination conditions produce the sturdiest transplants.

1. 

   Sow in modules

   Fill modules with fresh seed compost. Sow one seed per cell at 1cm depth. Place in a cold frame or on a cool, bright windowsill at 10–18°C. No artificial heat needed — cauliflower prefers cool germination.

2. 

   Grow on carefully

   Keep compost evenly moist. Germination takes 7–12 days. Grow on at 10–15°C until plants have 4–5 true leaves. Do not allow to become pot-bound — pot-bound plants suffer an immediate growth check.

3. 

   Prepare a very firm bed

   Tread the bed several times to firm it thoroughly. Add a general brassica fertiliser if the soil is light. Lime if pH is below 6.5. Cauliflower needs the firmest, most fertile soil of all brassicas.

4. 

   Transplant at 60cm

   Plant at 60cm spacing. Firm each plant in very well — press the soil down hard around the roots. Water in thoroughly. Disturb the roots as little as possible during planting — any damage causes a growth check.

5. 

   Water without fail

   Cauliflower cannot tolerate any check in growth. Water deeply and regularly throughout the season. In dry spells, water every 2–3 days. Mulch around plants immediately after planting to retain moisture.

6. 

   Harvest

   When the curd begins to form, snap or tie inner leaves over it to protect from sunlight and frost. Harvest when the curd is firm, white, and still tight — do not delay as quality deteriorates quickly.

Regional sowing timing

Region	Sow / plant	Harvest	Notes
Scotland & Far North	Apr–May	Jul–Sep	Sow under cover in April. Summer cauliflower only — autumn types may not mature before hard frosts. · Apr–May
Northern England	Mar–May	Jul–Oct	Sow under cover from March for summer crops. Autumn varieties suit this region well. · Mar–May
Midlands & Wales	Feb–May	Jun–Oct	February start under cover for early summer harvest. Autumn varieties reliable. · Feb–May
Ireland & Isle of Man	Feb–May	Jun–Oct	February start under cover for early summer harvest. Autumn varieties reliable. · Feb–May
South & SE England	Feb–May	Jun–Nov	Widest window. Successional sowings give harvests from June through to November. · Feb–May
South Coast & SW	Jan–May	May–Nov	January start under glass possible. Overwintering varieties suit milder SW winters. · Jan–May

08 Soil Requirements

pH

6.5–7.5

Best

Deep loam, Clay loam

Tolerates

Loam

Avoid

Sandy, Waterlogged, Acid

09 Ongoing Care

💧 Watering

Water deeply and consistently — every 10 days in dry weather as a minimum, more frequently in summer. A single dry week can trigger irreversible bolting or curd failure. Apply a mulch of compost around plants immediately after planting to hold moisture and even out extremes. In a dry summer, cauliflower will need more attention than almost any other crop on the plot.

🍃 Blanching

As soon as the curd reaches the size of a golf ball, bend the inner leaves over it and secure with a soft tie, rubber band, or clothes peg. This protects the developing curd from sunlight — which causes yellowing — and from frost damage in autumn. Check every few days and retie as the curd grows. Blanching is not optional for quality white curds.

🌱 Feeding

Apply a balanced granular fertiliser at planting time. A liquid feed every 2–3 weeks through summer supports steady, consistent growth. Avoid excessive nitrogen in the final 4 weeks before harvest — it encourages leafy, loose-structured curds rather than firm, tight ones. Brassica-specific feeds with added trace elements give the best results.

10 Watch Out For

🐛 Insects & pests

• 🦋 Cabbage Moth Caterpillar — Wilting or collapse of the central growing point of cabbages and Brussels sprouts
• 🦋 Cabbage White Caterpillar — Yellow, ribbed, skittle-shaped eggs in neat clusters on the underside of leaves in summer
• 🐜 Aphids (Blackfly & Greenfly) — Curled, distorted, or stunted growing tips — aphids inject saliva that causes leaf curl to protect them
• 🐌 Slugs & Snails — Silver slime trails on leaves, soil, and pots — often the first sign before damage is found

🍄 Diseases to watch

• 🥦 Clubroot — Clubroot (Plasmodiophora brassicae) is arguably the most feared soil-borne disease in UK kitchen gardens. It persists in the soil as resting spores for up to 20 years — meaning a bed that becomes infected is effectively lost for brassica growing for two decades without extraordinary intervention. Crop rotation is the most critical preventive measure.
• 🔵 Downy Mildew — Downy mildew is caused by oomycetes (water moulds) and is completely unrelated to powdery mildew despite the similar name. It thrives in cool, wet, humid conditions and is most damaging in spring and autumn. Each host plant has its own specific downy mildew species. Lettuce downy mildew can destroy an entire bed within days in the right conditions.
• 🩶 Botrytis (Grey Mould) — Botrytis cinerea (grey mould) is the most ubiquitous fungal pathogen in temperate gardens — present in virtually every garden soil and on plant debris. It becomes a disease only when conditions favour it: cool, humid, poorly ventilated environments with damaged or senescent plant tissue. In a greenhouse in autumn it can destroy an entire tomato or grape crop.

Full identification and treatment advice is in the Pests and Diseases sections.

11 Storage & Preserving

🧺 Fresh Storage

Store whole heads stem-up in the fridge for up to 7 days, loosely wrapped in a damp cloth. The leaves protect the curd — do not remove them until just before use. Cut florets keep for 2–3 days in a sealed bag. Home-grown cauliflower deteriorates faster than shop-bought — eat within a week of harvest for best flavour.

❄️ Freezing

Break into florets, blanch in boiling water for 3 minutes, plunge into ice water, drain, and freeze flat on a tray before bagging. Keeps for up to 12 months. Texture softens but flavour remains very good. Frozen cauliflower is excellent in soups, gratins, curries, and cauliflower cheese.

🍳 Cooking a Glut

Cauliflower cheese is the classic glut solution — one large head feeds a family. Also outstanding roasted whole at 200°C with olive oil and spices. Cauliflower soup blends beautifully. Pickled cauliflower florets are excellent with cheese and cold meats.

12 Expert Tips

13 Common Mistakes

14 See Also

• 🔄 Crop Rotation
• 🥦 Broccoli