Chlorogalum pomeridianum

Common Names

Soap Plant, Amole, Wavy-leafed Soap Plant, Soaproot, California Soaproot, Soap Lily, Indian Soap Plant

Summary

Soap plant is a bulbous geophyte native to California and Oregon, occurring from southern Oregon to southern California in dry open habitats such as rock bluffs, grasslands, chaparral, and open woodlands. It forms a basal tuft of long, wavy-edged leaves and sends up a tall flowering stalk bearing star-like white flowers that open in the late afternoon or evening and are fragrant; blooms display green or purple midveins and yellow-tipped stamens. The large underground bulb contains saponins used to produce soap, and the plant is fire-adapted with contractile roots that pull the bulb deeper to survive fire, with foliage that is drought-deciduous and often dies back in summer.

Cultivation emphasizes full sun to light shade and very low irrigation once established, with well-drained soils that tolerate loam, chalk, or sand and adaptation to a Mediterranean climate; hardy to USDA zones 6–10. Propagation occurs by seed sow in spring or summer (about 2 mm deep; germination 1–6 months at 15°C) or by bulb offsets divided in late summer to fall, with regular moisture in the first year and deep, infrequent watering thereafter. Uses include soap from crushed bulbs, edible young leaves (raw or cooked), and fibers around the bulb used for brushes; it is a native garden plant for drought-tolerant landscapes and attracts bees and butterflies.

Lifecycle

Perennial

Height

2-3 feet

Spread

1.5-3 feet

Hardiness Zones

Zones 6-10

Sunlight Requirements

Full sun to partial shade.

Soil Type

Well-drained soil

Soil Drainage

Well-drained

Soil pH

5.5-8.0

Bloom Color

White

Bloom Time

Spring to Summer

Foliage Color

Green

Fall Foliage Color

Green

Leaf Lifecycle

Deciduous

Growth Rate

Moderate

Seasons of Interest

Spring and Summer

Propagation Methods

Seeds and Division

Attracts Wildlife

Attracts bees, butterflies, and other pollinators