Troubleshooting
Coral Bark Maple problems — and how to fix them
Coral Bark Maple (Acer palmatum 'Sango-kaku') 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.
Reduced stem colour
Fades on older wood — rejuvenate by pruning some stems to the base to encourage bright young growth.
Leaf scorch
Brown leaf margins from drought, hot afternoon sun, or wind exposure; improve watering consistency and provide shelter.
Verticillium wilt
Dieback of individual branches; prune back to healthy wood and sterilise tools between cuts.
Aphids on new growth
Common in spring; treat with insecticidal soap or neem oil if population is high.
Late frost damage
Emerging spring foliage is frost-sensitive; protect with fleece if late frost threatens after bud-break.
Prevent coral bark maple problems before they start
Most coral bark maple issues are care-mismatch, not bad luck. Dial in the basics:
Coral Bark Maple problems — FAQ
Why is my coral bark maple reduced stem colour?
Fades on older wood — rejuvenate by pruning some stems to the base to encourage bright young growth.
Why is my coral bark maple leaf scorch?
Brown leaf margins from drought, hot afternoon sun, or wind exposure; improve watering consistency and provide shelter.
Why is my coral bark maple verticillium wilt?
Dieback of individual branches; prune back to healthy wood and sterilise tools between cuts.
Why is my coral bark maple aphids on new growth?
Common in spring; treat with insecticidal soap or neem oil if population is high.
Why is my coral bark maple late frost damage?
Emerging spring foliage is frost-sensitive; protect with fleece if late frost threatens after bud-break.