Delphinium Seed Collection, Storage, and Spring Sowing

When to Harvest Delphinium Seeds

Wait until seed pods are completely dry and brown—usually several weeks after flowering. Green pods contain immature seeds that won't germinate. In early July, your pods may not be ready yet.

Proper Seed Handling

• Collect pods on a dry day; place in paper bag to finish drying indoors for a week.
• Gently crush pods over a white plate to release small, dark seeds.
• Store in airtight container in cool, dark place (refrigerator works well).

Sowing Schedule for Best Results

1. Start seeds indoors 8 weeks before last frost (February–March in most zones).
2. Sow 1/4 inch deep in moist, sterile seed-starting mix.
3. Provide bright light (grow lights ideal) and 65–70°F.
4. Transplant to individual cells when seedlings have 2–3 true leaves.
5. Harden off after last frost: 10 days in protected shade, then full sun.

Follow-Up: Seed Color Concerns

If your seeds appear grayish or whitish rather than black, they may be from a particular cultivar or slightly immature. Test viability by sowing a sample—nature will determine what germinates.