Sow indoors, February-April. A warm kitchen windowsill is all you need for starting these seeds. Sow thinly on the surface of a small tray of pre-watered compost. Place in a warm, light position. A temperature of 20-25°C (68-77°F) is ideal. Keep the compost moist. The tray can be covered with clingfilm to preserve humidity, but remove when seedlings appear, usually in 21-28 days. Transplant them, 5cm (2″) apart, to other trays when large enough to handle. Always hold by a leaf, never by the stem. Grow on in cooler, but not cold conditions. Gradually accustom young plants to outside conditions (avoid frosts), before planting out, May-June, 20cm (8″) apart, into well-drained soil, when frosts are over. Flowers: June-October.
Do not allow young plants to dry out. They can also be grown as house plants. Simply pot up individually and keep in a cool, airy position.
Flowers
Flowers