Troubleshooting
Acer rubrum problems — and how to fix them
Acer rubrum (Acer rubrum) 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.
Iron chlorosis
Yellowing leaves with green veins on alkaline or chalky soil; correct by acidifying the soil or applying chelated iron, and choose another tree for high-pH sites.
Weak branch unions
Fast growth produces narrow, included branch angles prone to splitting in storms; prune for strong central structure while young.
Surface roots
Vigorous shallow roots can heave lawns, paving and drains; site well away from hard surfaces and shallow foundations.
Verticillium wilt
Soil-borne fungus causing sudden branch dieback and dark streaking in the wood; remove affected limbs and avoid replanting maples in known-infected ground.
Prevent acer rubrum problems before they start
Most acer rubrum issues are care-mismatch, not bad luck. Dial in the basics:
Acer rubrum varieties: common problems
Looking for acer rubrum in general rather than its problems? Read the full acer rubrum care guide — light, water, soil and feeding.
Acer rubrum problems — FAQ
Why is my acer rubrum iron chlorosis?
Yellowing leaves with green veins on alkaline or chalky soil; correct by acidifying the soil or applying chelated iron, and choose another tree for high-pH sites.
Why is my acer rubrum weak branch unions?
Fast growth produces narrow, included branch angles prone to splitting in storms; prune for strong central structure while young.
Why is my acer rubrum surface roots?
Vigorous shallow roots can heave lawns, paving and drains; site well away from hard surfaces and shallow foundations.
Why is my acer rubrum verticillium wilt?
Soil-borne fungus causing sudden branch dieback and dark streaking in the wood; remove affected limbs and avoid replanting maples in known-infected ground.