Troubleshooting
Ranunculus asiaticus problems — and how to fix them
Ranunculus asiaticus (Ranunculus asiaticus) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Corm rot
Soft, mouldy corms from oversoaking or wet soil. Soak just 3-4 hours, pre-sprout in barely moist medium, and plant in free-draining soil.
Botrytis (grey mould)
Fuzzy grey rot on flowers and buds in cool, damp conditions. Ventilate, remove affected blooms quickly, and cut flowers before they fully open.
Powdery mildew
White film on foliage in warm, still, humid air. Space plants, improve airflow, and keep leaves dry.
Premature dormancy in heat
Foliage yellows and dies back early above the low 20s°C. Plant early for a long cool growing window and provide afternoon shade in warm climates.
Prevent ranunculus asiaticus problems before they start
Most ranunculus asiaticus issues are care-mismatch, not bad luck. Dial in the basics:
Ranunculus asiaticus varieties: common problems
Looking for ranunculus asiaticus in general rather than its problems? Read the full ranunculus asiaticus care guide — light, water, soil and feeding.
Ranunculus asiaticus problems — FAQ
Why is my ranunculus asiaticus corm rot?
Soft, mouldy corms from oversoaking or wet soil. Soak just 3-4 hours, pre-sprout in barely moist medium, and plant in free-draining soil.
Why is my ranunculus asiaticus botrytis (grey mould)?
Fuzzy grey rot on flowers and buds in cool, damp conditions. Ventilate, remove affected blooms quickly, and cut flowers before they fully open.
Why is my ranunculus asiaticus powdery mildew?
White film on foliage in warm, still, humid air. Space plants, improve airflow, and keep leaves dry.
Why is my ranunculus asiaticus premature dormancy in heat?
Foliage yellows and dies back early above the low 20s°C. Plant early for a long cool growing window and provide afternoon shade in warm climates.