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.
Watch The Brussels Sprouts Growing Video
Brussels sprouts are a long-season crop where early planning, spacing and firm soil make a real difference.
Use the video as the visual shortcut, then open the guide and planting dates before committing bed space.
Not sure when to sow? See our When to Plant Brussels Sprouts UK →
Founder & Head Grower, SoilCommander · RHS Level 2 · 12+ years growing in Yorkshire
I've been growing vegetables on my Yorkshire allotment and raised beds since 2012. Everything I write is based on what I've actually grown, failed at, and eventually got right in a real UK climate.
Quick Facts
March – April
May – June
September – February
60cm apart, 60cm rows
Moderate
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. The RHS stresses firm planting to prevent wind-rock, and liming to raise soil pH above 6.5 to suppress club root.
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
Essential Tools & Supplies
Watch this short guide on how to grow Brussels sprouts in the UK garden — from sowing seeds indoors to harvesting firm, frost-sweetened buttons in winter.
🌱 Did you know? Brussels sprouts taste sweeter after a frost — the cold converts starches to sugars, making them far more flavourful than shop-bought ones.
Plan Your Vegetable Garden
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Use these links when the guide moves from reading into sowing, planting, watering, and keeping the crop healthy.
Plan the next step
Use the printable UK Vegetable Garden Planner to turn this guide into sowing dates, bed layouts, and weekly garden tasks.