Delphiniums are easy to start from seed if you provide some simple requirements.
- Use fresh seed packaged for this year. Older seed germinates poorly.
- Chill the seed after sowing at 35-40 degrees for about 3 weeks.
- Maintain darkness until the seeds sprout.
I sow the seed at 2-3 seeds per cell pack since the seed won’t be good next year and the package always contains more than enough. I cover the seed with about 1/8 inch of soil mix, mist with water, and then place the flat in a black plastic garbage bag. To provide cold I put the bagged flats in my unheated garage but you could also use a refrigerator. After 3 weeks of chilling, bring the flat back inside into a typical winter temperature room, 65-70F, but maintain darkness by leaving it covered with the plastic bag. Check daily for the first sprouts - they will appear in a week or two - and then remove the bag, cover with a humidity dome and place under lights.