Choose a sunny location with cool conditions
Prepare rich, well-drained soil with compost
Sow seeds directly in early spring or fall in mild climates
Soak seeds overnight before planting if desired
Plant seeds 1 to 2 inches deep
Space seeds 2 to 4 inches apart
Provide a trellis, fence, or support for climbing
Keep soil evenly moist but not waterlogged
Mulch to retain moisture and keep roots cool
Pinch out growing tips when plants are young
Remove faded flowers regularly to encourage blooming
Feed with a low-nitrogen fertilizer during growth
Protect plants from extreme heat
Watch for aphids, mildew, and slugs
Harvest flowers often to promote more blooms
Remove plants after flowering ends and save seeds if desired