Allium munzii

Common Names

Munz's Onion

Summary

Munz's onion is a bulb-forming perennial herb endemic to western Riverside County, California. It grows up to about 35 cm tall and bears umbrella-like umbels of 10–35 flowers whose petals have white bases with pink or green mid veins, reddening toward the tips, and it has an onion-like odor and taste. The plant spends most of the year underground as a bulb and blooms in March–May in grassy openings within coastal sage scrub on wet mesic clay soils at elevations roughly 400–900 m.

In cultivation and management, it requires clay soils in grassland and sage scrub habitats with moderate water needs; it reproduces by seeds or bulb division and flowers March–May. The species is federally endangered and protected under the Western Riverside County Multiple Species Habitat Conservation Plan, with designated critical habitat, and threats include urbanization, agricultural development, clay mining, and off-road vehicle use.

Lifecycle

Perennial

Height

6-14 inches

Sunlight Requirements

Ideally full sun.

Soil Type

Clay soils.

Soil Drainage

Wet mesic clay soils

Bloom Color

White to Pink

Bloom Time

Spring (April–May)

Foliage Color

White

Leaf Lifecycle

Deciduous

Growth Rate

Slow; 3–5 years to reach reproductive maturity after germination.

Seasons of Interest

Spring, Winter, Summer

Propagation Methods

Seeds, bulb division

Attracts Wildlife

Attracts butterflies, likely attracts other pollinators