GENERAL INFORMATION
Scientific Name: Delphinium x hybrida
CommonName: Larkspur
Hardiness Zone: 5a - 8b
Hardiness Degree: -20°F (-20°C)
Blooming Season: Spring, Late Spring, Summer
Plant Habit: Upright
Characteristics: Deer Resistant, Frost Tolerant
Water: Medium
Fertilizer: Once a month
Spacing: 18 - 24" (46 - 61cm)
Height: 24 - 28" (61 - 71cm)
Width: 16 - 18" (41 - 46cm)
Exposure: Sun
PROPAGATION
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
FINISHING
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.
CROP SCHEDULING
1–qt. (10–cm) pot, 1 plant per pot: Not recommended
1–gal. (15–cm) pot, 1 plant per pot: Winter: 12-16 wks; Summer: 10-12 wks
2 to 3–gal. (25 to 30–cm) pot, 3 plants per pot: Winter: 12-16 wks; Summer: 10-12 wks
Bloom Months: April to July