🌱 February Sowing Guide for Greenhouses

February is a key sowing month for greenhouse growers. While outdoor conditions are still unreliable, the protection of a greenhouse allows you to start a wide range of crops early — giving stronger plants and earlier harvests later in the year.

⭐ Recommended Products — February Gardening Essentials

• Early Spring Seed Collection (February Sowing)
A pack of seeds suited for February sowing — think early onions, brassicas, tomatoes, chillies, and early flowers like pansies and primroses. Great for getting a head start on the growing season.
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• Seed & Cutting Propagation Compost
Fine, well-draining compost formulated for seeds and cuttings. Essential for giving young roots the ideal environment to establish strongly without rotting.
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• Seed Trays & Propagator Kit
Includes reusable seed trays, modules, and clear lids to create a controlled germination environment. Helps maintain humidity and protects young seedlings.
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• Heat Mat & Grow Lights for Seed Starting
Provides bottom heat and supplemental light — especially helpful in February’s low light and cooler temperatures to improve germination and early growth.
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• Plant Labels & Waterproof Marker Set
Keep track of your sowings with durable labels and a weather-proof pen — very useful when starting lots of different seeds in February.
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🌿 Vegetables to Sow in a Greenhouse in February

These crops perform reliably under greenhouse protection.

🧅 Onions (from seed)

• Sow in trays or modules
• Ideal temperature: 10–15°C

Why sow now:
Long growing season — early sowing produces stronger plants and larger bulbs.

🥬 Leeks

• Sow thinly in trays or modules
• Keep cool but frost-free

Why sow now:
February sowings lead to thicker stems and better crops.

🥦 Brassicas (early varieties)

Includes:

• Cabbage
• Cauliflower
• Calabrese
• Brussels sprouts

How to sow:

• Sow in modules

Why sow now:
Creates sturdy transplants ready for early planting out.

🌿 Celery

• Surface sow (do not cover seed)
• Keep warm and moist

Why sow now:
Very slow-growing and needs an early start.

🌶️ Warmth-Loving Crops (Heated Greenhouse or Propagator)

Only sow these if you can provide steady warmth and good light.

🍅 Tomatoes

• Germination temperature: 18–22°C

🌶️ Chillies & Peppers

• Germination temperature: 20–25°C

🌿 Aubergines

• Germination temperature: 22–25°C

🌾 Crops to Sow in an Unheated Greenhouse

These tolerate cooler greenhouse conditions.

🥬 Lettuce (hardy varieties)

• Sow in trays or modules
• Protect from hard frost

🌱 Spinach

• Sow in modules
• Keep compost just moist

🫛 Peas (early varieties)

• Sow in guttering, pots, or modules
• Protect from mice

🌿 Broad Beans

• Sow in deep pots or modules

🌸 Flower Seeds to Sow in a Greenhouse in February

Greenhouses are ideal for early flower sowing.

• Sweet peas
• Antirrhinums
• Lobelia
• Petunias
• Begonias (from seed)

🌿 Herbs to Sow in a Greenhouse

• Parsley
• Chives
• Coriander
• Basil (only with warmth)

❄️ February Greenhouse Sowing Tips

• Clean greenhouse glass to maximise light
• Ventilate on mild days to prevent condensation
• Avoid overwatering cold compost
• Remove heat once seeds germinate
• Label everything clearly

⚠️ What Not to Sow Too Early

Avoid sowing these in February:

• Courgettes
• Squash
• Sweetcorn
• Climbing beans

They grow too fast and struggle under low light.