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Black Spots in Delphiniums
verifiedReviewed by the GreenScout Team
Delphiniums are iconic tall perennials with spectacular columnar flower spikes in shades of blue, purple, white, and pink
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Delphiniums care requirements
These care conditions are most relevant to black spots in Delphiniums. Check each one as a potential cause.
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Humidity
Moderate humidity with excellent air circulation to prevent powdery mildew and crown rot.
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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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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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Symptoms to look for in Delphiniums
- fiber_manual_recordBlack or dark brown spots
- fiber_manual_recordSpots with yellow halos
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Common causes in Delphiniums
- fiber_manual_recordFungal disease (black spot)
- fiber_manual_recordBacterial infection
- fiber_manual_recordSunburn
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How to diagnose black spots in Delphiniums
Fungal spots: often circular with yellow margins. Sunburn: irregular bleached patches turning black.
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How to treat black spots in Delphiniums
Remove affected leaves. Apply fungicide. Adjust sun exposure.
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Preventing black spots in Delphiniums
Avoid wetting foliage. Provide adequate spacing. Remove debris.