Arnica
Arnica montana · Asteraceae
The gardener's calendar
Ideal time to plant arnica: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- June to August
- Adult size
- 30 to 60 cm in height
- Growth
- Moderate
- Hardiness
- Very hardy (-20 °C)
- Origin
- Central European mountains
- Soil type
- Well-drained, slightly acidic
Care
Light Requirements
Arnica montana prefers a location in full sun or partial shade. It appreciates at least 6 hours of direct sunlight daily for abundant flowering. Avoid overly shaded areas as these will reduce flower production.
Soil
This plant requires well-drained soil as it fears waterlogged conditions. A poor to moderately fertile substrate, slightly acidic to neutral, is ideal. Improve drainage with gravel or sand if your soil is compacted.
Watering
Water moderately during the growing period, ensuring the soil dries out between waterings. Arnica tolerates dry periods well once established. Avoid excess moisture at all times, particularly in winter.
Fertilizing
A moderate fertilizer application in spring is quite sufficient. Prefer a balanced fertilizer or one slightly higher in phosphorus to encourage flowering. Overly rich soil can reduce plant vigor and increase disease susceptibility.
Pruning and Maintenance
Remove spent flowers regularly to extend the flowering period. In late autumn, cut stems back to ground level. Clean away dead foliage to prevent fungal disease development.
Diseases and Pests
Arnica montana is generally robust but can suffer from root rot in excessively moist conditions. Slugs may damage young shoots; protect the plant if needed. Ensure good air circulation to prevent fungal diseases.
Did you know?
Arnica montana has long been used in traditional Alpine medicine to soothe bruises and inflammation. Its golden-yellow flowers are so prized that the species is threatened in its natural habitat and collecting is regulated in several European countries.
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.