California Native Plant Society
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Alnus viridis
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Green Alder
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Alnus viridis

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About Green Alder (Alnus viridis) Alnus viridis (Green Alder) is an alder with a wide range across the cooler parts of the Northern Hemisphere. It is a large shrub or small tree 3-12 meter tall with smooth grey bark even in old age. The leaves are shiny green, ovoid, 3-8 centimeter long and 2-6 centimeter broad. The flowers are catkins, appearing late in spring after the leaves emerge (unlike other alders which flower before leafing out); the male catkins are pendulous, 4-8 centimeter long, the female catkins 1 centimeter long and 0.7 centimeter broad when mature in late autumn, in clusters of 3-10 on a branched stem. The seeds are small, 1-2 millimeter long, light brown with a narrow encircling wing.
Plant Description
Plant Type

Max. Height
9.8 - 75.5 ft (3 - 23 m)

Flower Color

Native Status

Natural Setting
Site Type
Creek and meadow edges

Part Shade

Elevation ?
10' - 8959'

Annual Precip. ?
23.9" - 153.3"

Summer Precip. ?
1.33" - 5.61"

Coldest Month ?
28.7° F - 46.6° F

Hottest Month ?
47.2° F - 70.9° F

Humidity ?
0.26 vpd - 21.71 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

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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