Delphinium grandiflorum
Summer
Profusely branching genetically compact dwarf larkspur with masses of flowers in attractive colors
The Summer series is earlier to flower with better heat tolerance than other delphiniums of this type
All colours do not require vernalisation and can be grown as annuals
Ideal bedding or in gardeniers
Crop Time
Spring: 16 – 20 weeks
Height
12 ″ / 30 cm
Exposure
Sun – Partial shade
Seed Form
Raw Seed
Heat Zone
6 – 1
Hardiness Zone
3 – 7
Best Uses
Bedding, Cutflower, Landscape
Culture guide
Usage
Perennial, first year flowering. Bedding and border plants, pot and mixed containers.
Sow time
December-May
Sowing method
2-3 seeds per plug
Germination
14-18 days at 68-72 °F (20-22 °C). Cover seed lightly and maintain constant humidity levels during Stage I.
Growing on
Transplant plugs 6-8 weeks after sowing into 3.5″ (9 cm) to 1 quart (1 liter) containers. For larger containers, use 3 plants per pot. Avoid planting plugs too deep. Provide good ventilation. Begin fertilizing at 200 ppm nitrate nitrogen in a 2-1-2 ratio fertilizer mix. Avoid soluble salt buildups. Finish at temperatures of 45-75 °F (7-24 °C). Temperatures above 85 °F (29 °C) can cause flower abortion. Temperatures below 55 °F (13 °C) under short days will cause plants to form rosettes and will delay flowering. At lower temperatures, use extended day length or night interruption with incandescent lights to avoid rosette formation.
Media
Use a well-drained media, pH: 5.8-6.5.
Temperature
Grow at 13-16 °C or outdoors.
Fertilization
Moderate fertilization levels are required.
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