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Average Seed / oz | Seed / 100' Row | Average Yield / 100' Row | Days to Harvest |
9000 | n/a | n/a | 130 |
Planting Season | Ideal Soil Temp | Sun | Frost Tolerance |
After Last Frost | 65-85°F | Full/Part | Frost Sensitive |
Sowing Method | Seed Depth | Direct Seed Spacing | Seeds Per Packet |
Transplant or Direct Seed | 1/8" | 6-8" | 140 |
Mature Spacing | Days to Sprout | Production Cycle | Seed Viability |
24-36" | 10-16 | Annual | 1 year |
Larkspur giant delphinium is an annual that tolerates full sun to partial shade and average, well-drained soils with moderate moisture.
Direct sow outdoors after the last frost date or start seed indoors 6-8 weeks before the last frost and transplant outdoors once the danger of frost has passed. Optimal soil temperature for germination is 65-85°F. Sow seeds 1/8" deep and 6-8" apart. Seeds will germinate in 10-16 days. Thin seedlings to 24" apart. Flower stalks may need staking. For a succession of blooms, sow seeds every 2-3 weeks.
Harvest cut flowers anytime during the flowering period. Delphinium will readily re-seed if a few flowers are left to mature.