Sow lobelia in a heated propagator.
Plant begonia tubers in pots of moist compost and cover with a little more compost. Keep them in a bright, frost-free position.
Sow antirrhinums (snapdragons) and laurentia now to ensure early flowering.
Start dahlia tubers into growth by planting them in pots of compost, maintaining a minimum temperature of 10 degrees celsius.
Sow sweet peas in a glasshouse, cold frame or a cool place indoors. Soak sweet pea seeds in tepid water overnight before planting them, to speed up germination.
Grow your own chrysanthemum plants from seed – start them off now in the greenhouse for the earliest blooms.
Sow geraniums (pelargoniums) indoors now for earlier flowers.
Plant or pot on hardwood cuttings taken last year.
Pot on rooted cuttings of tender perennial plants taken last summer.
The veggies and herbs.
Start growing (chitting) early potatoes on a windowsill indoors.
Start sowing cucumber and tomato seeds for the greenhouse, in warm conditions.
Sow peas – try sowing them in upcycled guttering with drainage holes drilled in the bottom.
Start asparagus pea seeds under cover for planting out in late spring.
Sow aubergine seeds now for indoor crops this summer.
Grow your own basil on the windowsill to flavour your favourite Italian dishes and fill your kitchen with heady Mediterranean aromas.
Start early sowings of brassicas under cover. Try Brussels sprouts, summer cabbage, cauliflower 'All the Year Round', and calabrese 'Aquiles'.
Start slow-growing celeriac seeds now under cover.
Try bolt-resistant varieties of celery, such as 'Lathom Self Blanching', for early sowings.
Sow leeks under cover – these vegetables need a long growing season.
Try growing really large onions this year – sow 'Bunton's Showstopper' and 'Ailsa Craig' indoors now.
Sow sweet peppers for growing on in a heated greenhouse. Always provide plenty of warmth.