How to sow flowers indoors

How to sow flowers indoors

Find out how to sow flowers under cover in late winter, for early flowers a few months later.

A table displaying which months are best to sow, plant and harvest.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
At its best
At its best

Plant is not at its best in January

Plant is not at its best in February

Plant is not at its best in March

Plant is not at its best in April

Plant is not at its best in May

Plant is at its best in June

Plant is at its best in July

Plant is at its best in August

Plant is not at its best in September

Plant is not at its best in October

Plant is not at its best in November

Plant is not at its best in December

To do
To do

Do not To do in January

Do To do in February

Do not To do in March

Do not To do in April

Do not To do in May

Do not To do in June

Do not To do in July

Do not To do in August

Do not To do in September

Do not To do in October

Do not To do in November

Do not To do in December

For an early display of flowers, sow seed indoors in winter and early spring. This will give you a head start on seeds sown outdoors from April, with blooms appearing up to four weeks sooner.

Flowers to sow in late-winter to early spring include ageratum, antirrhinum, clary, cornflower, echium, French marigold, nigella, rudbeckia, salvia, scabious and zinnia.

Follow our guide to sowing flowers indoors, below.

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You Will Need

  • Multi-purpose, peat-free compost
  • Vermiculite
  • Seed tray or small pots

Step 1

Firm and water the compost before sowing. Check sowing depths so you know how much space to leave at the top of the pot for covering seed. Space them evenly and cover with vermiculite, perlite or sieved compost.

Sowing flower seed
Sowing flower seed

Step 2

Keep the pot in a well-lit postion and short, stocky seedlings should emerge. As soon as the true leaves are large enough to hold, they are ready for you to transplant. Leggy, tall seedlings are fragile and prone to damage.

Flower seedlings
Flower seedlings

Step 3

Gently tap the pot so you can pull out the seedlings. Take care to handle the seedlings by their seed leaves, rather than their stems, and gently prise them apart. Pot seedlings singly.

Transplanting flower seedlings
Transplanting flower seedlings
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