B and T World Seeds' reference number:
USDA average, annual, minimum temperature Zone:4
Type of plant - perennial
Flower: pale to deep YELLOW, infl. 7-20, in capit.
Height in meters: 0.6
Parts of Arnica longifolia are considered toxic.
is included in the following B and T World Seeds flowering plant categories:
6: Bulbous and Rhizomatous Plant Seed List
43: Herbaceous Border Plant Seed List
76: Californian Native Plant Seed List
88: Natives of U.S.North West
94: Natives of Rocky Mountain Area U.S.A.
185: Plant Species whose germination is improved by Smoke
Arnica longifolia seeds will usually germinate in 25-30 days. Sow seeds about 1mm deep in a Well drained seed sowing mix at about 12°C.
Likes an acid sandy soil.