Choose a location with full sun to partial shade
Use well-draining, fertile soil
Sow seeds indoors 8 to 10 weeks before the last frost or plant transplants after frost danger passes
Press seeds lightly onto the soil surface; do not cover deeply
Keep soil consistently moist until germination
Space plants according to variety, usually 6 to 12 inches apart
Water at the base to keep foliage dry
Mulch lightly to retain moisture and suppress weeds
Pinch young plants to encourage bushier growth
Deadhead spent flowers to promote more blooms
Fertilize lightly every few weeks during the growing season
Protect plants from extreme heat and hard frost
Watch for aphids, rust, and powdery mildew
Cut back plants after flowering to encourage a second flush in cool weather