Seed Variety

Delphinium Blue Donna

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Data is gathered from our Elburn, Ill., trials (Zone 5a) for a North American audience. Warm-climate growers: expect 1-2 weeks earlier finishing. Cool-climate growers: expect 1 week slower. Dates based on standard 288 plug size.

Notes/Pitfall Management
A light Sumagic spray when the flower spike is 4"-6" tall can reduce overall container height.
Week color desired
Sow week
Plug transplant week
Early Spring
(1 ppp)
(1 ppp)
(1 ppp)
(1 ppp)
Seed Form: RAW
PlugSize: 288
Seeds/Cell: 1
Plug Crop Weeks: 6-8
Days from 50% to maximum germination: 7-10
Cover Seed: Yes
Plug Production
Stage 1
Moisture: Level 4
Temperature: 68-72°F
Light: Optional
Stage 2
Moisture: Level 3
Temperature: 65-68°F
Light: 6-8 mol·m⁻²·d⁻¹
Fertilizer: Less than 100 ppm N
(Less than 0.7 EC)
Stage 3
Moisture: Level 2-3
Temperature: 65-68°F
Light: 6-8 mol·m⁻²·d⁻¹
Fertilizer: 100 to 175 ppm N
(0.7 to 1.2 EC)
Stage 4
Moisture: Level 2
Temperature: 60-65°F
Light: 6-8 mol·m⁻²·d⁻¹
Fertilizer: 100 to 175 ppm N
(0.7 to 1.2 EC)
Vernalization: No
Propagation Key Tips: For forcing info: See Perennials Forcing Guide.
Spray damp-off fungicide.
Growing on to Finish
Growing on Temperature: (day) 65-70°F (18-21°C)
(night) 57-60°F (14-16°C)
Target Media pH/EC (1:2): 5.8-6.2 pH
1.3-1.6 mmhos/cm
Fertilizer: 175 to 225 ppm N
(1.2 to 1.5 EC)
Daylength: Day Neutral
Fertilizer Notation: Container production: Fertilize every other irrigation with 15-0-15 at 150 to 200 ppm.
Finishing Key Tips: See Cut Flower section for cut flower production for both field and greenhouse. Monitor for Powdery Mildew.