A gorgeous native perennial flower as well as an extraordinary medicinal herb, arnica is easy to grow though not the easiest to start from seed. Established arnica gently spreads each season, hardy and tenacious with prolific flowers for beneficial pollinators as well as medicine-makers. The most common pitfall is sowing her tiny seeds too deeply, hindering her emergence; it can also be tricky to keep the soil moist adequately as arnica germinates. A heat mat goes far in hastening germination, especially for perennial seeds like arnica. At Fruition, we sow arnica in soil blocks 6 weeks before final frost and transplant after final frost.