Western Buttercup
Ranunculus occidentalis
Care
full sun, part shade
moderate
0–2ft tall
Jan-Dec
Friendly
Prized
Grasslands and wetlands throughout California from sea level to 8000 ft elevation, extending to British Columbia and east to the Rocky Mountains.
Care Guide
Planting
Plant your western buttercup in full sun to part shade during winter or early spring to take advantage of the natural blooming season. Space plants according to the mature height range of 0.3 to 2 feet, depending on variety. The Calscape data doesn't specify soil requirements, so prepare a well-draining planting area and water in after planting.
After Planting
Water moderately during the first growing season - roughly weekly during dry spells - then reduce frequency as the plant establishes. Western buttercup flowers from winter through spring, so expect modest growth during warmer months; the plant's dormancy pattern isn't fully documented in available care data. Note that handling or damaging the plant releases protoanemonin, a compound that can irritate skin, so wear gloves during pruning or deadheading if desired.
Endangered & Threatened Species Supported
California state-listed; limited range in Sierra Nevada
California state threatened species
Wildlife Supported
Insects
Primary pollinator; collects pollen for larval provisions
Early spring pollen collection for brood provisioning
Larval food plant for this endemic California butterfly species
Primary pollinator; collects pollen for larval provisions
Spring/early summer nectar source for colony establishment
Early season nectar and pollen for queen foraging
Oomycete pathogen; wet season disease pressure
Spring forage for colony buildup and early honey production
+2 more species
Birds
Early spring forage as snow recedes in alpine/subalpine California habitat