Soak seed in warm water prior to sowing. Sow May/June in pots in a greenhouse, coldframe or indoors. Maintain 25°C (77°F) for 4-5 weeks then lower to 10°C (50°F). Germination can be slow and erratic, 40-60 days. Transplant to a site in full sun or partial shade in autumn to begin flowering the following year. When established, plant out 40cm (16") apart in a sunny position. Protect the plants from frost during winter. May also be sown direct outside in autumn.