Delphiniums
Delphinium elatum
flowerDelphiniums are iconic tall perennials with spectacular columnar flower spikes in shades of blue, purple, white, and pink. These majestic plants can reach 4–6 feet tall and create dramatic focal points in borders and cutting gardens. They require cool climates and careful staking for best results.
Common Problems
Select the problem your Delphiniums is experiencing to get a treatment guide.
Care Guide
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Light
Full sun (6–8 hours daily) for optimal flowering; afternoon shade beneficial in hot climates.
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Water
Keep soil consistently moist but not waterlogged; excellent drainage essential. Water at base to prevent foliar diseases.
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Soil
Rich, well-draining soil amended with compost or leaf mold. Prefers slightly alkaline to neutral pH (6.5–7.5).
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Fertiliser
Feed monthly with balanced or slightly lower-nitrogen fertilizer during growing season. Avoid excessive nitrogen.
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Temperature
Prefers cool climates (50–70°F); struggles above 75°F. Hardy to zone 2 (–50°F) but often short-lived in hot regions.
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Humidity
Moderate humidity with excellent air circulation to prevent powdery mildew and crown rot.
Toxicity
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All parts are highly toxic, containing cardiac glycosides and other alkaloids. Dangerous to cats, dogs, and children; avoid ingestion.
Common Diseases
Common Pests
Seasonal Care
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Resume regular watering and feeding as growth picks up.
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Peak growing season. Water and feed regularly.
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Reduce watering as growth slows. Stop heavy feeding.
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Minimal watering and feeding. Protect from frost if needed.