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Azure Penstemon
Penstemon azureus
About Azure Penstemon (Penstemon azureus) Nurseries Show All Photos Penstemon azureus is a species of penstemon known by the common name azure penstemon. It is native to the mountains of Oregon and northern California, where it grows in coniferous forests and woodlands. It is a perennial herb, woody toward the base, with many thin branches reaching up to about 70 centimeters in maximum height. The oppositely arranged leaves are linear or lance-shaped, the ones higher on the plant clasping the stem. The flower cluster produces several hairless tubular flowers in shades of blue to lavender measuring up to 3.5 centimeters long.
Plant Description
Plant Type
Perennial herb

Max. Height
0.7 - 2.3 ft (0.21 - 0.7 m)

Flower Color
Green, Purple, Lavender, Blue

Flowering Season
Spring, Summer

Native Status

Natural Setting
Site Type
Moist, open places

Sun, Part Shade

Elevation ?
99' - 10173'

Annual Precip. ?
21.9" - 119.7"

Summer Precip. ?
0.38" - 4.07"

Coldest Month ?
24.7° F - 49.9° F

Hottest Month ?
49.0° F - 76.3° F

Humidity ?
0.48 vpd - 26.55 vpd

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


Landscaping Information
Ease of Care
Moderately Easy

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

Propagation ?
For propagating by seed: No treatment.

Common uses
Deer Resistant, Bird Gardens, Hummingbird Gardens, Butterfly Gardens, Bee Gardens

Nursery Availability
Commonly 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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