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Great Valley Gumweed
Grindelia camporum

About Great Valley Gumweed (Grindelia camporum) Grindelia camporum is a species of flowering plant in the daisy family known by the common names Great Valley gumplant and Great Valley gumweed. The plant is native to California and Baja California, where it can be found in a number of habitats including chaparral and woodlands. Its range may extend into Nevada. It is hardy plant that also readily grows in disturbed and altered areas such as ditches and roadsides. Grindelia camporum is a gangly perennial up to 2 m (6 ft. ) in maximum height but usually less. Its erect, branching stems are lined with many stiff, wavy-edged, serrated leaves 2 to 3 cm long. Atop the stem branches are inflorescences of a single large flower head up to 3 cm wide. The head is a vaguely thistlelike cup of green clawlike phyllaries that bend downward. The centre of the head is filled with yellow disc florets and there are usually many yellow ray florets around the circumference. The flower head fills with a copious white exudate, especially during the early stages of blooming. It is a traditional Native American medicinal plant, used by the Indigenous peoples of California and also a major pollinator attractant.
Plant Description
Plant Type
Perennial herb

Max. Height
2 - 6.6 ft (0.6 - 2 m)

Max. Width
3 ft (0.9 m)

Growth Rate

Summer Semi-Deciduous

2-15 cm long, with basal leaves longest and smallest near flowers, smooth, entire or serrate.

Flower Color

Flowering Season
Spring, Summer, Fall

Native Status

Natural Setting
Site Type
Sandy or saline bottomlands of interior valleys, also mountains to 4,000 ft., coastal bluffs, and rocky cliffs on the Channel Islands


Elevation ?
-3' - 8045'

Annual Precip. ?
5.4" - 72.6"

Summer Precip. ?
0.14" - 2.39"

Coldest Month ?
25.5° F - 56.4° F

Hottest Month ?
52.2° F - 78.9° F

Humidity ?
0.30 vpd - 30.02 vpd

Soil Description

Soil Texture
Loamy Sand, Sand

Soil PH
6.0 - 8.0

Soil Toxicity Tolerance
Tolerates Saline Soil

Fast, Medium, Slow

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

Sunset Zones ?
7*, 8*, 9*, 14*, 15*, 16*, 17, 18, 19*, 20*, 21*, 22, 23, 24

Companion Plants
Because this plant is fairly widespread across the state, companion plants will depend on locality but may include native grasses, Penstemon sp., Lupines (Lupinus sp.), Poppies (Eschscholzia or Papaver sp.), and various native cactus and succulents.

Wildlife Attracted
Numerous insect pollinators are attracted to the flowers. Species in the Grindelia genus are host plant to the Common Buckeye and Great Copper butterflies.

Landscaping Information
Ease of Care
Very Easy

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

Moderately Popular

Max. Summer Water ?
No Summer Water, 1x/month
No Summer Water
Keep moist

Pest Control
Highly resinous nature defends this plant against herbivory from insects.

Propagation ?
For propagating by seed: No treatment.

Common uses
Deer Resistant, Butterfly Gardens, Butterfly Gardens

Nursery Availability
Commonly Available

Other Names
Botanical Names
Grindelia camporum var. camporum

Common Names
Common Gumplant, Great Valley Gumplant

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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