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Arroyo Willow
Salix lasiolepis
About Arroyo Willow (Salix lasiolepis) Nurseries Show All Photos Arroyo Willow is an abundant and widespread native tree or shrub that grows in northern, southern and central California. It tends to grow in marshes or other wet areas, at elevations from 0-7000 feet. It grows in or adjacent to many habitats including coastal sage scrub, riparian, southern oak woodland, yellow pine forest, and central oak woodland habitats. It is an indicator species for freshwater marsh. It spreads by root runners and will tend to fill in moist areas. In the garden it must have constantly moist soil. It is deciduous, so it will be leafless for part of the year. The flower is a yellowish catkin that is important to many insects and birds. It is used most often for restoration projects.
Plant Description
Plant Type
Tree, Shrub

Max. Height
7 - 35 ft (2.1 - 10.7 m)

Max. Width
15 ft (4.6 m)

Upright, Rounded, Upright Columnar

Growth Rate
Fast, Moderate

Winter Deciduous

Flower Color
Cream, Yellow

Flowering Season
Spring, Winter

Native Status

Natural Setting
Site Type
Shores, marshes, meadows, springs, other moist areas


Elevation ?
-714' - 12704'

Annual Precip. ?
3.2" - 151.0"

Summer Precip. ?
0.14" - 5.63"

Coldest Month ?
19.2° F - 57.0° F

Hottest Month ?
41.2° F - 83.5° F

Humidity ?
0.10 vpd - 35.42 vpd

Soil Description
Tolerates a variety of soils as long as adequate drainage is provided

Soil PH
5.0 - 8.0

Slow, Standing

Cold Tolerance(° F)
Tolerates cold to -15° F

Sunset Zones ?
1, 2, 3, 4, 5, 6*, 7*, 8*, 9*, 10, 11, 12, 13, 14*, 15*, 16*, 17*, 18*, 19*, 20*, 21*, 22*, 23*, 24*

Companion Plants
Use with other wetland plants such as Cattail (Typha sp.), Maple (Acer sp.), Alder (Alnus sp.), Mulefat (Baccharis salicifolia), Spicebush (Calycanthus occidentalis), Dogwood (Cornus sp.), Oceanspray (Holodiscus discolor), Black Walnut (Juglans sp.), Sycamore (Platanus racemosa), Cottonwood (Populus sp.), Currant (Ribes sp.), and California Wild Rose (Rosa californica)

Wildlife Attracted
Willows (Salix sp.) in general are very important wildlife plants, used by numerous birds, insects, amphibians and mammals

Landscaping Information
Ease of Care
Very Easy

Water Requirement ?
Moderate - High
Extremely Low
Very Low
Moderate - High

Moderately Popular

Max. Summer Water ?
Keep moist
No Summer Water
Keep moist

It can be pruned or sheared in winter to form a hedge

Pest Control
Numerous insects, especially wasps, lay their eggs on willow leaves, forming galls. Though sometimes unsightly, these galls are usually not harmful to the plant and should not be viewed as pests.

Propagation ?
For propagating by seed: No treatment. Use fresh seeds (usually only viable a few days). Seeds should not be covered or pressed into a medium. Seedbed should be kept saturated for the first month. Easily propogated from cuttings.

Common uses
Bogs and Ponds, Hedges, Bird Gardens, Butterfly Gardens, Bee Gardens

Other Names
Botanical Names
Salix lasiolepis var. bigelovii

Common Names
Arroyo Uillou

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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