California Buttercup (Ranunculus californicus) is a cheerful and adaptable perennial (sometimes annual) wildflower native to California and parts of the western U.S. It typically grows in grassy slopes, oak woodlands, and coastal scrub, often appearing in early spring, or even late winter, before many other wildflowers have emerged. Its glossy, bright yellow petals and shiny green foliage make it a vibrant presence in both natural landscapes and native gardens. This buttercup is especially valued for its resilience to seasonal drought and its ability to thrive in a range of habitats, from coastal lowlands to inland hills.
 
California Buttercup is an important early-season nectar and pollen source for native pollinators, including solitary bees, hoverflies, and small beetles. The plant also contributes to soil stabilization on slopes and disturbed ground, helping to build resilient native plant communities. California Buttercup is listed as a threatened species in WA state, with only a small handful of populations occurring in the San Juan Islands. 
 
California Buttercup grows best in full sun to part shade and well-drained soils, including sandy, loamy, or rocky types. It is easy to grow from seed and often self-sows in favorable conditions. Fall sowing is recommended, allowing natural cold stratification to aid germination. Its low-growing form and brilliant blooms make it ideal for wildflower meadows, under oaks, or along trail edges in restoration projects and pollinator-friendly gardens.