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Eriodictyon trichocalyx
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Hairy Yerba Santa
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Eriodictyon trichocalyx

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About Hairy Yerba Santa (Eriodictyon trichocalyx) Eriodictyon trichocalyx is a species of flowering plant in the Boraginaceae (Forget-me-not) family known by the common name I is native to southern California and Baja California where it grows in several habiat types, including chaparral and grassland There are wo recognized varieies wih differen ranges Var. lanatum is restricted to the Peninsular Range of San Diego County. Var. trichocalyx is restricted to the Transverse Range. It is a shrub growing erect up to about 2 meters tall, with lance-shaped to oval leaves up to 14 centimeters long. They are hairless and resinous to densely woolly. The inflorescence is a cluster of white to light purple bell-shaped flowers. A closely related species is Thick-leaf Yerba Santa (E. crassifolium) which is somewhat more common in chaparral. All members of this genus are valuable nectar plants for butterflies.yerba san. It is native to southern California and Baja California, where it grows in several habitat types, including chaparral and grassland. It is a shrub growing erect up to about 2 meters tall, with lance-shaped to oval leaves up to 14 centimeters long. They are hairless and resinous to densely woolly. The flower cluster is a cluster of white to light purple bell-shaped flowers.
Plant Description
Plant Type

Max. Height
3 - 7 ft (0.9 - 2.1 m)

Max. Width
2 - 6 ft (0.6 - 1.8 m)


Growth Rate


Flower Color
White, Purple

Flowering Season

Native Status

Natural Setting
Site Type
Slopes, mesas, ravines, grassy places in dry mountain and desert transition zone

Part Shade, Sun

Elevation ?
52' - 11501'

Annual Precip. ?
3.3" - 52.5"

Summer Precip. ?
0.15" - 2.94"

Coldest Month ?
28.0° F - 59.1° F

Hottest Month ?
49.8° F - 88.4° F

Humidity ?
1.23 vpd - 39.10 vpd

Soil Description
Typically sandy or decomposed granite

Soil PH
6.0 - 7.2


Cold Tolerance(° F)
Tolerates cold to 0° F

Companion Plants
This plant is best used in arid mountain or high Desert gardens.

Trees: Joshua Tree (Yucca brevifolia), California Fan Palm (Washingtonia filifera), Blue Paloverde (Parkinsonia florida), Pinyon Pine (Pinus edulis or monophylla), California Juniper (Juniperus californica), and Yellow Pine (Pinus ponderosa)

Other Plants: Desert Willow (Chilopsis linearis),, Creosote Bush (Larrea tridentata), Ocotillo (Fouquieria splendens), Jojoba (Simmondsia chinensis), WhIte Bursage (Ambrosia dumosa), Chuparosa (Justicia californica), Barrel Cactus (Ferocactus cylindraceus), Desert Agave (Agave Deserti), BrIttlebush (Encelia farinosa), Apricot Mallow (Sphaeralcea ambigua), Desert Lavendar (Condea emoryi), and various cactus species, or wIth any chaparral plantsand various cactus species, or wIth any chaparral plants

Wildlife Attracted
Insects, especially butterflies

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

Seldom Used

Max. Summer Water ?
No Summer Water
Keep moist


Propagation ?
For propagating by seed: Oven heat of 194°F for 5 ruins. (Went et al. 1952). Alternative treatment for Eriodictvon species: soak seeds 24 hrs. in 1000 ppm potassium gibberellate ("Gibrel" growth substance; Merck & Co., Chem. Div. Rahway, n.J.J, then sow or dry and store in refrigerator for up to 6 mos. before spring (Francis Ching, personal communication 1962).

Common uses
Bank Stabilization, Hedges, Butterfly Gardens, Bee Gardens

Nursery Availability
Sometimes 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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