Ranunculus californicus aka California Buttercup

Ranunculus californicus is also known as California buttercup. It is a perennial, a plant that lives for years. It belongs to the buttercup family, Ranunculaceae. Its native range starts in southwestern Oregon and runs through California. It reaches northern Baja California, Mexico. It grows in grassland, open woods, and grassy coastal bluffs. These sites range from sea level to about 6,560 feet [2,000 metres]. It comes from temperate regions, but not Britain or Ireland. Plants grow to about 2 feet [0.6 metres] tall.

Plants For A Future records blooms from May to July. Each flower has both male and female organs. Insects pollinate the flowers. The supplied species accounts do not describe flower colour or shape. Nor do they describe this species' leaves or stems. You can raise new plants from seed. You can also grow this plant in garden beds. Choose a site that meets its soil and water needs.

Choose moist soil, with loam as the best soil type. The plant also grows in sand and clay soils. It accepts slightly acid, neutral, and slightly alkaline soil. It grows in full sun or part shade. Plants For A Future lists USDA hardiness zones 6–9. The plant copes with strong winds, but not direct sea exposure. Growth on coastal bluffs does not mean every exposed seaside garden suits it. The same source says it can hold back nearby plants' growth. This effect is strongest with legumes. Bear this in mind when choosing plants to grow beside it.

Sow seed in a cold frame in spring. Move each seedling to its own pot when large enough to handle. Plant them out in summer. You can also split plants in spring to make more. Put large divisions straight into their final sites. Grow small divisions in pots in a cold frame with light shade. Give them time to take root and grow. Then plant them out in late spring or early summer.

Plants For A Future records a minor food use for cooked seeds. People have used ground seeds in dishes like porridge. They have also used them in soups and bread mixes. This does not mean raw plants are safe to eat. The source found no poison report for this species itself. But it warns that related buttercups contain poisons. Their sap can also cause skin blisters. It lists no known uses as medicine or for other purposes.