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Seeds to Sow in March

Growing conditions across the UK in March can vary dramatically. By mid-March your soil might be starting to warm up, or it could still be too cold to sow. It is always worth checking your soil temperature before you start to plant seedlings directly into the soil.

There are still a few seed varieties you will need to sow inside. If you have a propagator or greenhouse, this is ideal. But if not, then a warm and bright window sill works well too.

From the beginning of March onwards here is our list of seeds to sow indoors:

Vegetable and Salad Seeds

  • Celery
  • Celeriac
  • Kale
  • Swiss Chard
  • Tomatoes
  • Cucumbers
  • Chilli peppers
  • Rocket
  • Marrow
  • Radish

From mid-March onwards you can also sow these seeds outdoors under a cloche or cold frame:

  • Brussels Sprouts
  • Summer Cabbage
  • Beetroot
  • Cauliflower
  • Leeks
  • Onions
  • Peas
  • Spring Onion
  • Carrots
  • Turnips


Flower Seeds

Hardy Annuals

  • Sweet Peas
  • Wildflower Mixes
  • California Poppies
  • Cornflowers

Half Hardy Annuals

  • Cosmos

Tender Perennials

  • Dahlias


What you will need

  • Seed trays, module trays or pots with drainage holes
  • Seed sowing compost
  • Seeds
  • Hand Trowel
  • Cling film/ glass or a heated propagator with lid


See our Tips for Sowing Seeds Article for a step by step guide


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