Quick answer: 11 butterfly and moth host plants are native to Washington, 10 with a live listing as of 16 Sep 2026.
11 species
- Bearberry Arctostaphylos uva-ursi · 16 states
- Bog Labrador tea Ledum groenlandicum · 4 states
- Canada wild rye Elymus canadensis · 18 states
- Chokecherry Prunus virginiana · 35 states
- Fireweed Chamerion angustifolium · 28 states
- Paper birch Betula papyrifera · 16 states
- Pearly everlasting Anaphalis margaritacea · 18 states
- Quaking aspen Populus tremuloides · 24 states
- Red-osier dogwood Cornus sericea · 22 states
- Rocky Mountain bee plant Peritoma serrulata · 22 states
- Smooth sumac Rhus glabra · 34 states