Asteraceae
Arnica longifolia
Arnica longifolia
Also known as Arnica polycephala, Arnica longifolia subsp. genuina, Arnica myriadenia, Arnica caudata
Flowering Plants · Edibles & Herbs · Native Plants · Arnica · Seep Arnica · Wildflower · Native · Alpine · Medicinal · Yellow Flowers · Perennial · Rock Garden · Mountain Plant
Seep arnica is a mountain wildflower native to western North America that produces cheerful yellow daisy-like blooms in summer and prefers cool, moist, well-draining soils in partial shade to full sun. It is well suited to rock gardens, native plant borders, and alpine-style landscapes where it can spread slowly via rhizomes to form attractive clumps. The genus Arnica has a long history of medicinal topical use, but handle with care as it can cause skin irritation in sensitive individuals.
Growing conditions
The details behind the basics
- Daily light
- 5 hours
- Watering
- Water to keep soil evenly moist but never waterlogged; ensure good drainage in rocky or sandy substrate · Every 7-10 days
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 6–8
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed, Division, Cutting
Hardiness
USDA 4b-9b
Form & growth
Mature size and habit
- Mature height
- 12 in – 4 ft
- Spread
- 4 ft
- Spacing
- 12 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- Alberta, British Columbia, California, Colorado, Idaho, Montana, Nevada, Oregon, Utah, Washington, Wyoming
- Attracts
- Bees, Butterflies, Moths
Sources: trefle, usda
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