Darmera peltata aka Indian Rhubarb

Darmera peltata is a leafy perennial called umbrella plant. Other names include giant cup and Indian rhubarb. It belongs to the saxifrage family, Saxifragaceae. Its native range runs from southwestern Oregon into northern and central California. It grows beside mountain streams and in nearby woods. These cool, wet sites help explain its needs in gardens.

The plant forms a large clump from thick rhizomes. Garden plants reach about 3–5 feet (0.9–1.52 metres) tall. Reported spread ranges from about 1.6–5 feet (0.5–1.52 metres). RHS gives a narrower spread than Missouri Botanical Garden. The large leaves form a mound after the flowers fade. Each leaf grows on a long stalk from the rhizome. Rounded green leaves have teeth and lobes along their edges. They can span about 1.5 feet (0.45 metres). Their glossy surfaces turn red in autumn. The plant loses its leaves for winter.

Small pink to white flowers open before the leaves appear. Thick, hairy stems carry rounded flower clusters above bare ground. Each flower measures up to half an inch across. Chicago Botanic Garden lists bloom from March to April. Missouri Botanical Garden lists April. The early flowers provide interest before the broad foliage develops. Later, the leaf mound remains attractive when soil stays moist.

Grow umbrella plant in moist to wet soil. It suits partial shade and can cope with deep shade. Full sun also works where the soil stays wet. RHS lists clay and loam as suitable soil types. It accepts acid, neutral, and alkaline soils, including poorly drained ground. Dry soil can scorch the leaves. Cool summers suit it better than hot, humid southern climates. Sources list USDA zones 5–7 and UK hardiness H6. RHS gives two to five years to reach full size. Divide plants in spring, or sow seed in spring or autumn.

Allow enough room for its broad leaf mound. Use it beside ponds, along streams, or in wet woodland gardens. It also suits bog gardens, rain gardens, and shaded borders. Its rhizomes help hold muddy banks and reduce soil loss. Sources report few pest or disease problems. Plants For A Future records no known hazards or medicinal uses. It lists peeled leafstalks as food, eaten raw or cooked. They can also go into soups and stews.