Sow seed indoors 4 weeks before last frost date or direct seed outdoors when soil has warmed. Germinates best at 27-30 degrees Celsius. A heat mat will speed germination. Lower temperatures result in slower germination. Sow seed 1.5-2 cm deep and transplant outdoors before seedlings become root bound. Transplant carefully so as not to disturb roots and space plants 25-35 cm apart Double flowers may revert to singles due to transplant shock. Plant in full sun in rich soil. Pinch out the growing tips for bushy plants Cut flowers before completely open.