Hairy Alpenrose
Rhododendron hirsutum · Ericaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around hairy alpenrose and prepare for winter.
ID card
- Foliage
- Evergreen, small, dark green and pubescent
- Flowering
- Spring (May-June), bright pink to red flowers in clusters
- Adult size
- 0.5 to 1.5 m tall, compact and dense habit
- Growth
- Slow to moderate
- Hardiness
- Very hardy (-20°C to -25°C), suited to mountain regions
- Origin
- Calcareous Alps (Austria, Switzerland, Germany)
- Soil type
- Rich in organic matter, well-drained, slightly acidic
Care
Watering
Water regularly to keep the soil moist but not waterlogged. During spring growth and summer, increase frequency. Reduce in winter. Prefer non-chalky or rainwater if possible.
Light Exposure
Plant in partial shade or dappled light, where the plant benefits from indirect light. Avoid hot afternoon sun which can damage the foliage. A cool, humid environment is ideal.
Soil
Ensure acidic to neutral soil, enriched with ericaceous compost and organic matter. Drainage must be excellent to prevent root suffocation. Mulch to maintain coolness and moisture.
Pruning
Prune lightly after flowering to maintain a compact and dense shape. Remove spent flowers to encourage branching. Avoid severe pruning which would slow growth.
Fertilizer
Apply fertilizer specific for ericaceous plants in spring and early summer. Follow recommended doses, as these plants tolerate excess mineral salts poorly.
Diseases and Pests
Watch for chlorosis caused by excess lime. Spider mites and scale insects may appear in too-dry atmosphere. Ensure good air circulation and maintain ambient humidity to prevent fungal infections.
Did you know?
Rhododendron hirsutum is an alpine species endemic to the calcareous Alps, remarkably adapted to rocky and mountainous environments. Its name 'hirsutum' means 'hairy' in Latin, referring to the fine down covering its leaves and stems. It is one of the few rhododendron species capable of tolerating chalky soils, making it invaluable for gardens in chalky regions.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.