[Wikipedia] Seed Details & Vigor, Toxin, Etymology: Arnica chamissonis has an active bloom period throughout the summer. There are approximately 400,000 seeds per pound. These individuals have a medium seedling vigor and a moderate vegetative spread rate. Seedling vigor refers to "the expected seedling survival percentage of the plant compared to other species with the same growth habit." A vegetative spread rate refers to how quickly a plant can spread through a given area. In general, A. chamissonis can be grown in a container, by using seeds or sprigs. Both A. montana and A. chamissonis contain the toxin helenalin. The species is named for German poet and botanist Adelbert von Chamisso, 1781?1838. (contributed by Mary Ann Machi)