Its ease of growing makes it a useful subject for introducing children to flower growing.
The many flowers in shades of pink through to purple appear from late June to October.
Week 14: Sow seeds in trays of seed compost and germinate at a temperature 10°-12°C (50°-54°F)
Germination should take three or four days.
Week 16: Prick out seedlings into cell trays or boxes of potting compost 50mm (2") apart, then place in a cold frame to harden off.
Week 20: Plant out 300mm (12") apart in full sun and reasonably fertile, well-drained soil.
Planting in groups rather than in rows tends to give a more pleasing display.
Avoid excessive feeding as this encourages leaf growth at the expense of flowers.