Erythronium helenae aka Napa Fawn Lily

Erythronium helenae is a bulbous perennial in the lily family, Liliaceae. Its common names include St. Helena fawn lily and Pacific fawnlily. It comes from west-northwestern California, near Mount St. Helena. This native range has a temperate climate. In the wild, it grows in woods and brush. Its habitat includes moist volcanic soil and layers of leaf mould. Records place it at elevations of 1,476–2,297 feet [450–700 metres].

This small plant forms clumps and loses its leaves each year. Garden plants reach about 0.3–1.6 feet [0.1–0.5 metres] tall. Their spread reaches about 0.3 feet [0.1 metres]. The RHS gives two to five years to reach full size. Leaves range from egg-shaped to lance-shaped. Brown mottling and white veins mark their surface. In spring, the plant bears one to three white flowers. Each flower has a bell shape, with broad yellow areas near its base. Both the marked leaves and pale flowers give it garden interest.

Grow it in partial shade, in a sheltered spot. It needs fertile soil with plenty of humus and good drainage. Keep the soil moist rather than letting it dry out. The RHS lists clay, chalk, loam, and sand as suitable soils. It also accepts acid, neutral, or alkaline soil. Plant bulbs about 0.3 feet [0.1 metres] deep. Keep stored bulbs slightly damp. The RHS rates it H3 for mild UK areas. PFAF lists USDA zones 4–8, so the two hardiness guides differ.

Use this fawn lily in woodland gardens or along shaded edges. The RHS also suggests rock gardens, borders, and informal planting. It can grow beneath roses and shrubs or in wildflower meadows. Choose sites that also meet its shade and moisture needs. Divide plants after flowering to make more plants. The plant needs no pruning. Slugs may attack it, but the RHS reports few disease problems. PFAF does not flag it as a weed.

Treat this plant as an ornamental, not a food crop. The RHS warns against eating its bulbs and flags risks to pets. It also advises gloves and protective gear when handling them. PFAF's food-use note relies on a different species, not direct evidence for this one. PFAF lists no known medicinal or other practical uses.