Arroyo Willow
Salix lasiolepis
Last reviewed: July 2026
Salix lasiolepis (Arroyo Willow) is a native shrub found throughout western North America that blooms from March to May. This moisture-loving willow thrives in riparian areas and provides important habitat for pollinators.
Arroyo Willow (Salix lasiolepis) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
The USDA PLANTS Database (opens in new tab) does not flag Arroyo Willow as toxic to livestock.
Light
full sun
Water
high
Size
60"–240" H × 60"–240" W
Bloom
Mar, Apr, May
Native to
AZ, CA, ID, NM and 5 more states
Pollinators
bees, butterflies, beetles
Browse plants for this ecoregion
Salix lasiolepis (Arroyo willow) is a native riparian shrub or small tree that grows rapidly in moist areas. It features slender branches with narrow, lance-shaped leaves that are silvery underneath and produces fuzzy catkins in early spring before the leaves emerge.
Growing Arroyo Willow
Grow Arroyo Willow in full sun and high water. Mature plants reach 60 to 240 inches tall and spread 60 to 240 inches wide. Expect high maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Arroyo Willow takes more care to keep looking intentional in a front yard. Maintenance level: high. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Extremely large size (up to 20 feet) inappropriate for typical front yards
- High water needs incompatible with drought-tolerant landscaping
- Can develop unruly growth habit without regular pruning
Wildlife value
Host plant for western tiger swallowtail.
Arroyo willow is highly beneficial for wildlife, supporting numerous bee species, butterflies, and beetles with its early-blooming catkins. It also provides nesting habitat for birds and shelter for small mammals.
Common questions
- Where does Arroyo Willow naturally grow?
- Arroyo Willow is native to nine western states: Arizona, California, Idaho, Nevada, New Mexico, Oregon, Texas, Utah, and Washington.
- When does Salix lasiolepis bloom?
- Arroyo Willow typically blooms from March through May, producing catkins before the leaves fully emerge.
- What pollinators visit Arroyo Willow?
- Arroyo Willow attracts various pollinators including bees, butterflies, and beetles. The early spring blooms provide crucial nectar when few other plants are flowering.
- What growing conditions does Salix lasiolepis prefer?
- This willow thrives in full sun to partial sun with consistently moist to wet soil conditions. It naturally occurs along streams, arroyos, and other riparian habitats.
- Is Arroyo Willow toxic to dogs?
- Arroyo Willow is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
- Is Arroyo Willow toxic to cats?
- Arroyo Willow is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
- Is Arroyo Willow toxic to livestock?
- The USDA PLANTS Database does not flag Arroyo Willow as toxic to livestock.
- Is Arroyo Willow HOA-friendly?
- Arroyo Willow takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
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.
Ready to grow Arroyo Willow? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz