Troubleshooting
Rhododendron 'Roseum Elegans' problems — and how to fix them
Rhododendron 'Roseum Elegans' (Rhododendron 'Roseum Elegans') 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.
Lime-induced chlorosis
Interveinal yellowing from high soil pH is the most common cultural problem. Correct with ericaceous compost, sulphur chips, and rainwater irrigation.
Phytophthora root and crown rot
Sudden wilt followed by death. Caused by Phytophthora cinnamomi in waterlogged soil. Prevention through good drainage is the only remedy.
Rhododendron bud blast
Brown, dried-out flower buds result from Seifertia azaleae fungus introduced by rhododendron leafhoppers. Control leafhoppers in August with insecticide.
Scale insects
Brown, waxy scale on stems reduces vigour. Apply a horticultural oil in late winter while the plant is dormant.
Wind scorch on large leaves
Exposed sites cause leaf margins to brown and desiccate in winter winds. Plant in a sheltered spot or provide a windbreak of evergreen hedging.
Prevent rhododendron 'roseum elegans' problems before they start
Most rhododendron 'roseum elegans' issues are care-mismatch, not bad luck. Dial in the basics:
Rhododendron 'Roseum Elegans' problems — FAQ
Why is my rhododendron 'roseum elegans' lime-induced chlorosis?
Interveinal yellowing from high soil pH is the most common cultural problem. Correct with ericaceous compost, sulphur chips, and rainwater irrigation.
Why is my rhododendron 'roseum elegans' phytophthora root and crown rot?
Sudden wilt followed by death. Caused by Phytophthora cinnamomi in waterlogged soil. Prevention through good drainage is the only remedy.
Why is my rhododendron 'roseum elegans' rhododendron bud blast?
Brown, dried-out flower buds result from Seifertia azaleae fungus introduced by rhododendron leafhoppers. Control leafhoppers in August with insecticide.
Why is my rhododendron 'roseum elegans' scale insects?
Brown, waxy scale on stems reduces vigour. Apply a horticultural oil in late winter while the plant is dormant.
Why is my rhododendron 'roseum elegans' wind scorch on large leaves?
Exposed sites cause leaf margins to brown and desiccate in winter winds. Plant in a sheltered spot or provide a windbreak of evergreen hedging.