Indoors: January to March or September to October.
Outdoors: March to April.
Almost fill 12cm (5in) pots with seed and cutting compost. Sow five seeds, evenly spaced, per pot and lightly cover with a little more compost. Water well after sowing, but not again until seedings have emerged. Place in warmth 10-15*c (50-60*f).
Pinch out the growing tips to encourage bushier plant growth and more flowers. Plant out 20cm (8in) apart from March onwards in a sunny position. March to April. Grow on in unheated conditions, ideally in a cold frame.
Sow seeds in pre-watered, warm soil 2cm (1in) deep, 10cm (4in) apart. Keep soil moist until seedlings emerge.
Support young plants with canes, netting or trellis to about 6ft (1.8m).
May to August.