Delphinium (P)
Delphinium cultorum
Perennial. Hardy in zones 3-7.
Start inside 8-10 weeks before planting out. Lightly cover seeds, provide darkness and cool temperatures; 10-13°C (50-55°F). Should germinate in 2-3 weeks. May also be direct seeded outside in early spring or early autumn. Transplant outside in early spring, into a full sun to light shade location, 24" apart. Delphiniums prefer rich soil, so work in compost or manure. Add bone-meal each spring and fertilize regularly. Deadheading regularly will keep plants strong and healthy. Keep evenly moist. Avoid windy areas. Divide every 3 years. Usually needs staking.
