When does arroyo willow bloom?

Arroyo willow produces its catkin flowers from March through May, typically before or as its leaves emerge.

How much water does arroyo willow need?

This shrub grows best with high, consistent moisture and is often found along stream banks, seasonal washes, and other riparian sites. It can tolerate somewhat drier conditions once established but performs poorly in dry upland soil.

What pollinators visit arroyo willow?

Bees, butterflies, and beetles visit the catkins for pollen and nectar, and willows in general serve as an important early season food source when few other plants are flowering.

How much light does arroyo willow need?

It grows best in full sun but will tolerate part sun to part shade, especially along shaded stream margins.

Does arroyo willow lose its leaves in winter?

Yes, it is deciduous and drops its leaves in fall, leafing out again along with its spring catkins.

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.

Arroyo Willow

Name: Pollinator Patch
Author: Pollinator Patch

Salix lasiolepis

Last reviewed: September 2026

Arroyo willow is a fast growing streamside shrub that blooms from March through May with small catkins. It thrives in full sun with consistently moist soil along creeks, washes, and riparian corridors.

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

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Browse plants for this ecoregion

Coast Range Marine West Coast Forest Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley Southern California Mountains North American Deserts Central Basin and Range Mojave Basin and Range Arizona/New Mexico Mountains Chihuahuan Deserts Madrean Archipelago Sonoran Basin and Range Southern California/Northern Baja Coast

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

When does arroyo willow bloom?: Arroyo willow produces its catkin flowers from March through May, typically before or as its leaves emerge.
How much water does arroyo willow need?: This shrub grows best with high, consistent moisture and is often found along stream banks, seasonal washes, and other riparian sites. It can tolerate somewhat drier conditions once established but performs poorly in dry upland soil.
What pollinators visit arroyo willow?: Bees, butterflies, and beetles visit the catkins for pollen and nectar, and willows in general serve as an important early season food source when few other plants are flowering.
How much light does arroyo willow need?: It grows best in full sun but will tolerate part sun to part shade, especially along shaded stream margins.
Does arroyo willow lose its leaves in winter?: Yes, it is deciduous and drops its leaves in fall, leafing out again along with its spring catkins.
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.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

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