California yerba santa (Eriodictyon californicum) is an evergreen shrub in the Borage family hat grows in central and northern California and parts of Oregon. It is commonly found in chaparral, woodlands, and forested areas, thriving in dry, rocky soils. This hardy plant spreads by underground rhizomes, often forming dense thickets that compete with nearby vegetation.
The plant’s long, narrow leaves, which can grow up to six inches, are coated in a sticky resin and often dusted with black fungi. The leaves emit a strong, bitter scent considered unpleasant by most and are generally avoided by animals. In late spring to summer, California yerba santa produces clusters of small, bell-shaped flowers that range from white to light purple, providing nectar for native pollinators.
Traditionally, this plant is valued for its medicinal uses by Indigenous peoples, including as a remedy for respiratory issues and skin conditions. However, it can be aggressive in the garden, so care should be taken to manage its spread.