California Mustard
Guillenia lasiophylla
Last reviewed: June 2026
Light
full sun
Water
low
Size
4"–24" H × 4"–12" W
Bloom
Apr, May, Jun
Native to
WA
Pollinators
bees, butterflies
Browse plants for this ecoregion
A compact annual forb that grows up to 2 feet tall with small yellow flowers appearing in spring and early summer. This drought-tolerant native thrives in full sun conditions and requires minimal water once established. As an annual, it completes its entire life cycle in one growing season.
In an HOA neighborhood
California Mustard takes more care to keep looking intentional in a front yard. Maintenance level: moderate. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Annual lifecycle creates gaps in plantings
- Can appear weedy or unkempt
- May self-seed unpredictably
Wildlife value
This plant provides nectar for bees and butterflies during its spring to early summer blooming period. Its flowers are particularly valuable for early-season pollinators when few other food sources may be available.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does California Mustard fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.