Downy Mildew on Sunflowers
Leaves problem · common pattern reported by gardeners · verify locally
What you'll see
- Yellow stunted seedlings
- White fuzz on undersides
- Dwarf plants
Most common causes
- Downy mildew fungus in cool wet soil
- Infected seed
- Overwatering
How to fix it
- Remove affected plants
- Improve drainage
Prevention: Resistant varieties Well-drained soil Don't overwater
More Sunflower problems
Grow Sunflower with confidence
Open the Sunflower growing guide → · Planting calendar · Pest & problem diagnoser
ZoneFig content reflects widely published extension-service and gardening guidance. Symptoms and causes are common patterns, not a diagnosis for any individual plant — verify locally and treat conservatively.