Winter hardy to USDA Zone 9-10. In zones 5 and lower it is grown as an annual. In the ground, plants do best in rich, humusy, well-drained loams in full sun with regular moisture. Purchase plants from nurseries in spring or start seeds indoors about 6-8 weeks before last spring frost. Set plants out after last frost date. Plants tend to sprawl, and are best spaced about 3’ apart unless staking or other support will be used. Deadheading flowers is not necessary. Harvest ripe seed for planting in the following spring. Self-seeding may occur in the zones 5 and lower area even though plants are not winter hardy. Container plants may be cut back and overwintered indoors in a sunny window.
