Allium unifolium

One leaf onion

Plant Type: Bulb
Sun: Sun
Drainage: Medium, Well-draining
Water: Naturalize
Height X Width: 2' X 1'
Santa Clara County Local: Yes
What do these mean?



The one leaf onion is one of the more popular of our native alliums. It is easy to grow and presents one to several prominent umbels of flowers white or pink. One leaf onion is found in clay soils in coastal mountains from Oregon to Baja. Following summer and winter dormancy the bulb sends up two to three flat, grass-like leaves. If the bulb is of sufficient size, the leaves are followed by the upright inflorescence in mid- to late spring. With the onset of the dry season, the plant drops copious seed and disappears entirely until the following spring. Although the bloom may be extended somewhat with additional water, it is probably better to not apply any additional water other than in a dry winter. Our native bulbs generally respond to moisture and warmth by rotting. The one leaf onion may be grown successfully in a pot, which may be an easier way to protect the bulb from summer moisture. Make sure the pot is stored in a cool, shady place in the summer. Bulbs can be fatally desiccated if overheated.


Deer Resistant: No
Attractive to Bees: Yes
Attractive to Butterflies: Yes
Good Under Oaks: No
Evergreen or Deciduous: Deciduous