Troubleshooting
Rhododendron 'PJM' problems — and how to fix them
Rhododendron 'PJM' (Rhododendron 'PJM') 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.
Winter scorch on exposed sites
Although hardy, browned leaf tips follow harsh frozen-soil winds. Mulch roots and water before deep freezes so the evergreen foliage stays hydrated.
Chlorosis
Pale leaves with green veins point to alkaline soil or iron deficiency. Keep the soil acidic with ericaceous mulch and treat with sequestered iron.
Root rot in wet soil
Phytophthora thrives in waterlogged ground, wilting and killing the shrub. Plant shallow in free-draining acidic soil and never in standing water.
Lace bug
Stippled, silvered upper leaf surfaces with dark frass beneath, worse in sunny dry sites. Maintain moisture and treat infestations early to limit foliage damage.
Prevent rhododendron 'pjm' problems before they start
Most rhododendron 'pjm' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for rhododendron 'pjm' in general rather than its problems? Read the full rhododendron 'pjm' care guide — light, water, soil and feeding.
Rhododendron 'PJM' problems — FAQ
Why is my rhododendron 'pjm' winter scorch on exposed sites?
Although hardy, browned leaf tips follow harsh frozen-soil winds. Mulch roots and water before deep freezes so the evergreen foliage stays hydrated.
Why is my rhododendron 'pjm' chlorosis?
Pale leaves with green veins point to alkaline soil or iron deficiency. Keep the soil acidic with ericaceous mulch and treat with sequestered iron.
Why is my rhododendron 'pjm' root rot in wet soil?
Phytophthora thrives in waterlogged ground, wilting and killing the shrub. Plant shallow in free-draining acidic soil and never in standing water.
Why is my rhododendron 'pjm' lace bug?
Stippled, silvered upper leaf surfaces with dark frass beneath, worse in sunny dry sites. Maintain moisture and treat infestations early to limit foliage damage.