General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Water Preferences: Wet Mesic
Mesic
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 4b -31.7 °C (-25 °F) to -28.9 °C (-20 °F)
Maximum recommended zone: Zone 9b
Plant Height: 2 to 3 feet
Plant Spread: 1 to 2 feet
Leaves: Deciduous
Flowers: Showy
Flower Color: Yellow
Bloom Size: 1"-2"
Flower Time: Late spring or early summer
Summer
Late summer or early fall
Underground structures: Rhizome
Wildlife Attractant: Butterflies
Resistances: Deer Resistant
Containers: Needs excellent drainage in pots
Conservation status: Least Concern (LC)

Conservation status:
Conservation status: Least Concern
Image
Common names
  • American Arnica
  • Leafy Arnica
  • Chamisso Arnica
Botanical names
  • Accepted: Arnica chamissonis
  • Synonym: Arnica chamissonis subsp. foliosa

Photo Gallery
Location: Yellowstone National Park
Date: 2022-08-23

Date: 2018-05-30
Location: Botanical Garden Cologne (Germany)
Date: 2017-08-14
Location: Botanical Garden Cologne (Germany)
Location: Cedarhome, Washington
Date: 2009-05-30
Comments:
  • Posted by Bonehead (Planet Earth - Zone 8b) on Mar 22, 2014 9:49 PM concerning plant:
    Native in the Pacific NW from Alaska to California, mostly occurring in or east of the Cascade Mountains. Spreads quickly and easily, but goes dormant about mid-summer so care should be given to placement. I had a nice stand of this, but then it just disappeared, not sure why. Will try again.

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