Rayless Arnica
Arnica discoidea
Care
part shade
0–2ft tall
Resistant
Friendly
North Coast and Cascade-Sierra region from Humboldt County to Modoc County, 2000-5000 ft elevation, in mixed conifer forests
Care Guide
Planting
Plant rayless arnica in partial shade, where it will thrive in Bay Area woodland and chaparral conditions. Space plants to accommodate their mature height of 1–2 feet. Plant in fall or winter when the soil is moist and the plant can establish its rhizomatous root system before the dry season.
After Planting
Water regularly during the first growing season to help the plant establish. Once established, rayless arnica is deer resistant and adapted to survive with minimal supplemental water, making it a low-maintenance choice for native gardens. The plant is a perennial that will emerge from its rhizomes each year, so avoid disturbing the soil around the plant's base.
Endangered & Threatened Species Supported
California Species of Special Concern
Wildlife Supported
Insects
Caterpillars feed on arnica leaves during spring-early summer development
Adults feed on arnica foliage during peak growing season
Mammals
Harvest arnica during hay-making season for winter cache
Graze in alpine and subalpine meadows where arnica occurs
Browse arnica foliage during spring green-up and early summer