Troubleshooting
Rainbow Leucothoe problems — and how to fix them
Rainbow Leucothoe (Leucothoe fontanesiana 'Rainbow') 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.
Loss of variegation
Too much shade causes new leaves to revert toward plain green; insufficient contrast suggests the cultivar needs brighter (but still indirect) light. Remove any fully green-reverting shoots promptly to prevent them from outcompeting the variegated portions.
Fungal leaf spot
Common in crowded, poorly ventilated positions or after overhead watering. Remove infected leaves, improve air circulation, and avoid wetting foliage when irrigating. Copper-based fungicide can help in persistent cases.
Tip dieback in severe winters
Although hardy to zone 5, exposed sites and winter sun on frozen soil cause desiccation. Mulch the root zone deeply before first frost and shelter from drying cold winds with a windbreak or fleece in the coldest zones.
Prevent rainbow leucothoe problems before they start
Most rainbow leucothoe issues are care-mismatch, not bad luck. Dial in the basics:
Rainbow Leucothoe problems — FAQ
Why is my rainbow leucothoe loss of variegation?
Too much shade causes new leaves to revert toward plain green; insufficient contrast suggests the cultivar needs brighter (but still indirect) light. Remove any fully green-reverting shoots promptly to prevent them from outcompeting the variegated portions.
Why is my rainbow leucothoe fungal leaf spot?
Common in crowded, poorly ventilated positions or after overhead watering. Remove infected leaves, improve air circulation, and avoid wetting foliage when irrigating. Copper-based fungicide can help in persistent cases.
Why is my rainbow leucothoe tip dieback in severe winters?
Although hardy to zone 5, exposed sites and winter sun on frozen soil cause desiccation. Mulch the root zone deeply before first frost and shelter from drying cold winds with a windbreak or fleece in the coldest zones.