🌱 What Seeds Need Heat to Germinate in February

February is a great time to start certain seeds — but only if you can provide extra heat. Some plants simply won’t germinate reliably in cool conditions, and sowing them without warmth often leads to failure, rot, or very weak seedlings.

If you have a heated propagator, heat mat, or consistently warm indoor space, these seeds are ideal to start now.

⭐ 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.
👉 Click here to see top options

• 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.
👉 Click here to see top options

• 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.
👉 Click here to see top options

• 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.
👉 Click here to see top options

• 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.
👉 Click here to see top options

🔥 Vegetable Seeds That Need Heat in February

These crops require warm compost to germinate successfully.

🌶️ Chillies

• Ideal temperature: 20–25°C
• Slow germination (often 2–3 weeks)

Why heat matters:
Without warmth, chillies may not germinate at all.

🌶️ Peppers (Sweet & Bell Peppers)

• Ideal temperature: 20–25°C
• Needs steady heat and good light

Why heat matters:
Cool conditions cause poor or uneven germination.

🍅 Tomatoes

• Ideal temperature: 18–22°C
• Only sow in February if you can provide strong light

Why heat matters:
Cold compost leads to slow, weak germination and leggy plants.

🌿 Aubergines

• Ideal temperature: 22–25°C
• Very slow to germinate

Why heat matters:
One of the most heat-dependent vegetable seeds.

🌿 Celery

• Ideal temperature: 18–21°C
• Surface sow — needs light to germinate

Why heat matters:
Cold conditions dramatically slow or stop germination.

🌸 Flower Seeds That Need Heat in February

Many ornamental flowers also require warmth.

🌸 Petunias

• Ideal temperature: 18–22°C
• Surface sow only

🌼 Begonias (from seed)

• Ideal temperature: 20–22°C
• Extremely fine seed

🌸 Lobelia

• Ideal temperature: 18–21°C
• Needs warmth and light

🌺 Verbena

• Ideal temperature: 20–24°C
• Can be slow and erratic without heat

🌿 Herb Seeds That Need Heat in February

Some herbs are also warmth lovers.

🌿 Basil

• Ideal temperature: 18–22°C

Why heat matters:
Cold compost causes basil seeds to rot.

🛠️ Best Ways to Provide Heat

You don’t need expensive equipment, but consistency matters.

Good options:

• Heated propagator
• Heat mat under seed trays
• Warm airing cupboard (for germination only)

👉 Once seeds germinate, remove heat and give maximum light to prevent weak growth.

⚠️ Common Heat-Related Mistakes

• Using heat without enough light
• Leaving seedlings on heat too long
• Overwatering warm compost
• Sowing heat-loving seeds in unheated greenhouses