How to Grow Brussels Sprouts in the UK

🥬 How to Grow Brussels Sprouts in the UK

Brussels sprouts are a classic British winter vegetable that thrives in the UK climate. This complete guide covers everything you need to know about growing Brussels sprouts successfully from sowing to harvest.

Not sure when to sow? See our When to Plant Brussels Sprouts UK →

Quick Facts

🌱 Sow Indoors:

March – April

🌿 Plant Out:

May – June

🥬 Harvest:

September – February

📏 Spacing:

60cm apart, 60cm rows

⭐ Difficulty:

Moderate

☀️ Position:

Full sun, sheltered spot

📅 When to Plant Brussels Sprouts in the UK

Brussels sprouts need a long growing season and are best planted in spring for winter harvesting. They're extremely hardy and taste better after frost.

Planting Timeline:

March – April: Sow seeds indoors in modules
May – June: Transplant seedlings outdoors
September – February: Harvest sprouts from bottom to top

Start Brussels sprouts early in March or April for the best winter harvests.

🌱 How to Sow Brussels Sprout Seeds

Brussels sprouts are best started indoors in modules, then transplanted outside when strong enough.

Indoor Sowing Method:

Fill modules with seed compost
Sow 2 seeds per module, 1.5cm deep
Water gently and keep at 15–20°C
Germination takes 7–12 days
Thin to one strong seedling per module
Transplant when 10–15cm tall (5–7 weeks)

💡 Pro Tip: Brussels sprouts need a long growing season (24–36 weeks), so don't sow too late. Early sowing ensures well-developed plants before winter.

🏡 Soil Preparation & Planting Out

Brussels sprouts need firm, fertile soil and a sheltered position. They grow tall and need support in exposed areas.

Soil Requirements:

Soil Type: Firm, well-drained, fertile soil
pH Level: 6.5–7.5 (neutral to slightly alkaline)
Preparation: Dig in well-rotted manure in autumn before planting
Position: Full sun, sheltered from strong winds

Transplanting Method:

Space plants 60cm apart in all directions
Plant very firmly — Brussels sprouts need stable roots
Plant up to the first true leaves
Water in well and firm soil around plants
Stake tall varieties to prevent wind rock

Firm planting is essential — test by tugging a leaf gently. The plant shouldn't move.

💡 Ongoing Care

Watering: Water regularly in dry spells; established plants are fairly drought-tolerant
Feeding: Apply a balanced fertiliser in July to support the long growing season
Staking: Stake tall varieties in July–August before autumn winds arrive
Earthing up: Draw soil up around the base of stems to improve stability
Netting: Cover with fine mesh from transplanting to protect from cabbage white butterfly and pigeons
Remove yellowing leaves: Strip off any yellowing lower leaves to improve air circulation

⚠️ Common Problems

Cabbage white butterfly: Caterpillars strip leaves. Use fine mesh netting from transplanting; check under leaves weekly for eggs.

Mealy cabbage aphid: Dense grey colonies on leaves and tips. Squash by hand or spray with insecticidal soap.

Clubroot: Swollen, distorted roots; stunted plants. Lime soil to pH 7+, rotate brassicas every 4 years, choose resistant varieties.

Blown sprouts: Loose, leafy buttons rather than tight ones. Almost always caused by loose planting — firm in well at transplanting time.

🥬 Harvesting Brussels Sprouts

When: October to February; flavour improves after frost
How: Pick from the base of the stem upwards as buttons firm up
Size: Harvest when buttons are 2–3 cm across and tight
Topping: Once lower sprouts are harvested, pinch out the growing tip to encourage upper sprouts to swell
Leaves: The leafy top (sprout tops) can be harvested and eaten like spring greens