Choose a sunny location with well-draining soil
Prepare the soil by loosening it and removing weeds
Plant sunflower seeds 1 to 2 inches deep
Space seeds 6 to 12 inches apart for smaller varieties
Space seeds 12 to 24 inches apart for larger varieties
Water the soil after planting
Keep the soil moist until seeds germinate
Thin seedlings if they are crowded
Water regularly during dry periods
Support tall varieties with stakes if needed
Remove weeds around the plants
Harvest seeds when the flower heads dry and turn brown