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Glaucous Willowherb Back to Plant Page
Epilobium glaberrimum

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About Glaucous Willowherb (Epilobium glaberrimum) Epilobium glaberrimum is a species of willowherb known by the common name glaucous willowherb. This clumping perennial wildflower is native to western North America from central Canada to northern Mexico. It generally grows at some elevation in moist places. This plant is somewhat variable in appearance. It may exceed half a meter in height and has hairless foliage with leaves between one and 8 centimeters long. The flower has four notched petals in purple, pink, or white which may be only a couple of millimeters long to over a centimeter long each. The fruit is a narrow, sticklike capsule 2 to 7 centimeters long. Two subspecies are recognized as valid:
Plant Description
Plant Type
Perennial herb

Max. Height
1 - 2 ft (0.3 - 0.6 m)


Growth Rate

Flower Color
Purple, Pink, White

Flowering Season

Native Status

Natural Setting
Elevation ?
1515' - 11273'

Annual Precip. ?
5.6" - 154.1"

Summer Precip. ?
0.26" - 5.94"

Coldest Month ?
21.4° F - 55.5° F

Hottest Month ?
42.8° F - 77.6° F

Humidity ?
0.89 vpd - 29.33 vpd

Soil Description
Prefers loamy or clay soils. Grows poorly in sandy soils.

Landscaping Information
Common uses
Bird Gardens, Hummingbird Gardens

Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Glaucus Willowherb

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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