Choose a sunny location with well-draining soil
Prepare the soil by loosening it and removing weeds
Sow zinnia seeds directly outdoors after the last frost
Plant seeds about 1/4 inch deep
Space seeds according to the variety, usually 6 to 12 inches apart
Cover seeds lightly with soil
Water gently after planting
Keep the soil consistently moist until germination
Thin seedlings if they are too crowded
Water at the base of the plants when the soil starts to dry
Avoid wetting the leaves to reduce disease
Remove spent flowers to encourage more blooms
Fertilize lightly if needed during the growing season
Watch for pests and diseases
Harvest seeds from dried flower heads if desired