Short-fruited willowherb
Epilobium montanum · Onagraceae
The gardener's calendar
Ideal time to plant short-fruited willowherb: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Blooming
- July to September
- Adult size
- 12 to 32 inches tall
- Growth
- Fast
- Hardiness
- Very hardy, down to -4°F
- Origin
- Mountains of central and western Europe
- Soil type
- Well-drained, moist, slightly acidic to neutral soil
Care
Watering
Keep the soil moist but not waterlogged, particularly during growth and flowering. Moderate watering once or twice a week is generally sufficient. Reduce watering in winter when the plant enters dormancy.
Light exposure
Place your alpine willowherb in partial shade or indirect light to encourage generous flowering. It also tolerates direct sun in temperate climates, but appreciates partial shade in hot regions.
Soil
Prepare a light, well-draining substrate rich in organic matter. Alpine willowherb prefers moist, slightly acidic soil. Adding compost or potting soil improves structure and moderate water retention.
Pruning and cleaning
Cut back the plant in late autumn or early spring before growth resumes. Remove dead or damaged stems to encourage more compact growth. Light pinching in summer promotes branching.
Fertilizing
Apply a balanced or potassium-rich fertilizer once a month during the growing season (spring-summer). Moderate feeding is sufficient; excess fertilizer promotes foliage at the expense of flowers.
Health and prevention
Alpine willowherb is fairly resistant to diseases. Watch for powdery mildew in humid conditions and root rot if drainage is poor. Ensure good air circulation and avoid watering the foliage late in the day.
Did you know?
Alpine willowherb is a pioneer plant prized by mountaineers and botanists, who frequently encounter it at altitude on stabilized slopes and scree. Its tiny seeds, equipped with silky plumes, spread easily on the wind, allowing it to rapidly colonize disturbed areas, particularly after mountain fires.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
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Tips generated and checked by Viridia — adapt them to your local climate.