★If growing Delphinium from seeds, germination is greatly increased by a 7-day cold treatment.
Place seeds and slightly damp paper towels in a bag and store in the refrigerator. Then planting material is placed in a gauze bag and left in a solution of potassium permanganate bright pink for 20 minutes. ★
✔Fill a seed tray to within 1/2 inch (1cm) of the top with sterile seed-starting compost. Mist the compost with water until the top 1 inch (2 cm) feels wet and let it soak in for five minutes before sowing the delphinium seeds.
✔Place the delphinium seeds on the surface of the compost, spacing them one inch (2 cm) apart. Cover them with a 1/4-inch (0.5 cm) thick layer of seed-starting compost. Mist it with water and gently firm the surface.
✔Place the seed tray outdoors in a sheltered, lightly shaded garden area where temperatures stay between 65 and 75 F (15-20 °C) during the day.
✔Watch for germination in 10 to 20 days.