Choose a sunny location with at least 6 to 8 hours of direct sunlight daily
Prepare well-draining soil with a pH between 5.5 and 7.5
Loosen the soil and remove rocks, weeds, and debris
Mix in compost or aged manure before planting
Sow seeds directly outdoors after the last frost
Plant seeds about 1/4 inch deep
Space seeds or seedlings according to the variety, usually 6 to 18 inches apart
Water lightly after planting to keep the soil evenly moist
Thin seedlings once they emerge to prevent overcrowding
Water at the base of the plants to keep foliage dry
Water deeply but infrequently once plants are established
Mulch around plants to help retain moisture and suppress weeds
Fertilize sparingly with a balanced fertilizer if needed
Deadhead spent flowers regularly to encourage more blooms
Pinch young plants to promote bushier growth
Watch for powdery mildew, aphids, and spider mites
Remove diseased leaves and improve air circulation if needed
Harvest flowers when blooms are fully open for cutting
Save seeds from mature flower heads if desired
Rotate planting locations each year to reduce disease problems