How To

March in the Seed Tray: What I Sow in March UK

The garden in March is quiet — but not empty. There’s a promise beneath the surface. For me, March is the month of hopeful hands dipping into seed packets while the wind still nips.

I start a few things indoors when t...

March 11, 2026
Author: Henry Kimber
Herboo Seeds
Chilli Machu Pichu in a 9cm pot on a windowsill

The garden in March is quiet — but not empty. There’s a promise beneath the surface. For me, March is the month of hopeful hands dipping into seed packets while the wind still nips.

I start a few things indoors when the sun is scarce but the days growing. Tomatoes, peppers and chillies take their place under a grow light, slow and steady. There’s something utterly calming about the way their tiny green shoots push up in trays — a reminder that warmth and light together unlock life.

Outdoors, the soil can still be cold and unpredictable, but that’s where the hardy seeds come in. Broad beans and peas are old friends — no fuss, just reliable. Spinach and radishes follow suit, quick to germinate if you catch a mild spell. I sow these directly into prepared soil, knowing they can handle a little frost.

Early Grown Seedlings in a seed tray

Seeds to Sow Indoors Now

- Tomatoes: a classic, slow to start but worth it
- Peppers and chillies: needing warmth and patience
- Early brassicas: cabbages, cauliflowers if you want an early crop

Radish French Breakfast Seeds

Hardy Seeds to Sow Outdoors

- Broad beans: rich in promise, early spring staples
- Peas: trail up wigwams, tempting pollinators next season
- Spinach: tender leaves that brighten early salads
- Radishes: fast, peppery, great progress if weather plays along

Seedlings coming up in the soil

Tips for March Sowing Success

Soil prep matters. I take my time loosening patches and removing weeds to give seeds a clean start. Watch the forecast — a cold snap will mean cover and waiting. Use cloches or fleece if the ground is still cold. And keep watering light but steady indoors. The first leaves will tell you when they’re ready to move outside.

It’s about reading the garden, sensing the soil’s heartbeat. March sows the quiet beginning. Then… you wait. And watch.

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