Troubleshooting
Japanese Big-Leaf Magnolia problems — and how to fix them
Japanese Big-Leaf Magnolia (Magnolia obovata) 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.
Wind-tattered leaves
The enormous leaves shred and tatter badly in exposed sites. Plant in a sheltered position with windbreak protection; once the tree gains height it creates its own shelter.
Late frost damage to flowers
Early summer blooms can be browned by late frosts in northern gardens. Site away from frost pockets and avoid positions where cold air pools.
Coral spot (Nectria cinnabarina)
Pink-orange pustules on dead wood indicate coral spot fungus. Remove all dead branches promptly; ensure good plant vigour through adequate moisture and nutrition.
Prevent japanese big-leaf magnolia problems before they start
Most japanese big-leaf magnolia issues are care-mismatch, not bad luck. Dial in the basics:
Japanese Big-Leaf Magnolia problems — FAQ
Why is my japanese big-leaf magnolia wind-tattered leaves?
The enormous leaves shred and tatter badly in exposed sites. Plant in a sheltered position with windbreak protection; once the tree gains height it creates its own shelter.
Why is my japanese big-leaf magnolia late frost damage to flowers?
Early summer blooms can be browned by late frosts in northern gardens. Site away from frost pockets and avoid positions where cold air pools.
Why is my japanese big-leaf magnolia coral spot (nectria cinnabarina)?
Pink-orange pustules on dead wood indicate coral spot fungus. Remove all dead branches promptly; ensure good plant vigour through adequate moisture and nutrition.