Troubleshooting
Hoogendorn Holly problems — and how to fix them
Hoogendorn Holly (Ilex crenata 'Hoogendorn') 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.
Black root rot
Thielaviopsis develops in wet or alkaline soil, causing decline; this cultivar must have acidic, free-draining ground and moderate watering.
Iron chlorosis
Yellowing leaves with green veins indicate high pH; lower it with sulphur or an acidifying fertiliser and apply chelated iron.
Scale and spider mites
Stressed plants attract sap-feeders that cause sticky residue or stippling; treat with horticultural oil and relieve drought stress.
Winter desiccation
Drying winter winds can brown the foliage; provide shelter in exposed sites and water thoroughly before the ground freezes.
Prevent hoogendorn holly problems before they start
Most hoogendorn holly issues are care-mismatch, not bad luck. Dial in the basics:
Looking for hoogendorn holly in general rather than its problems? Read the full hoogendorn holly care guide — light, water, soil and feeding.
Hoogendorn Holly problems — FAQ
Why is my hoogendorn holly black root rot?
Thielaviopsis develops in wet or alkaline soil, causing decline; this cultivar must have acidic, free-draining ground and moderate watering.
Why is my hoogendorn holly iron chlorosis?
Yellowing leaves with green veins indicate high pH; lower it with sulphur or an acidifying fertiliser and apply chelated iron.
Why is my hoogendorn holly scale and spider mites?
Stressed plants attract sap-feeders that cause sticky residue or stippling; treat with horticultural oil and relieve drought stress.
Why is my hoogendorn holly winter desiccation?
Drying winter winds can brown the foliage; provide shelter in exposed sites and water thoroughly before the ground freezes.