Vegetative Variety

Delphinium Red Lark

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Data is gathered from our West Grove, Pa., trials (Zone 6a). Southern growers: expect 1-2 weeks earlier finishing. Northern growers: 1 week slower. Consider summertime scheduling accurate. Dates based on a standard 72 liner size.

Week color desired
TC stick week
Liner transplant week
(1 ppp)
Long day facultative. Will flower faster early in the season using long day lighting. Southern growers and high light regions can finish Red Lark in 12-14 weeks. 50 plug or larger liners will finish a little faster.
Week color desired
TC stick week
Liner transplant week
(1 ppp)
Propagation Guide
Media EC/pH: 5.8-6.2
Soil Temperature: 68-72°F (21-22°C)
Rooting Hormone: None
Mist: Low mist or tenting
Fertilization: Balanced fertilizer 75-100 ppm
Pinching: None
Transplanting: 42-49 days
Comments: This is a tissue culture raised item. Please see our detailed tissue culture propagation guide at
Finishing Guide
Media pH: 5.8-6.2
Temperature: Nights: 55 to 60°F (13 to 16°C) Days: 60 to 70°F (16 to 21°C)
Light Level (fc): 5,000 to 8,000
Vernalization: No
Daylength: Long day facultative
Watering: Allow media to dry moderately between watering.
Fertilization: Use a balanced fertilizer at a rate of 150 to 175 ppm N.
Pinch After Transplant: None
Plant Growth Regulators: PGRs generally not needed
Pests and Fungal Diseases: Watch for typical pests, such as thrips, white fly, spider mites and aphids.