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Common Sun Rose
Crocanthemum scoparium

About Common Sun Rose (Crocanthemum scoparium) Crocanthemum scoparium is a species in the Cistaceae (Rockrose) family which is endemic to California. There may be some taxonomic confusion about this species, and some sources include it in the genus Helianthemum. Its common names include Peak Rockrose and Peak Rushrose. There are two recognized varieties, both uncommon. This is a small perennial shrub bearing long, smooth stems and small flowers each with five bright yellow petals. It is found in dry, sandy areas in hills and low mountains primarily along the coast from the Bay Area southward, with a concentration in San Diego County. It should be noted that there are many non-native varieties of Cistus that are commonly available in nurseries; almost all are commonly called Rock Rose or Sun Rose.
Plant Description
Plant Type

Max. Height
1.5 ft (0.46 m)

Max. Width
1.5 ft (0.5 m)

Summer Semi-Deciduous

Flower Color

Native Status

Natural Setting
Site Type
Dry, sandy, rocky slopes and ridges


Elevation ?
-3814' - 7419'

Annual Precip. ?
7.0" - 66.9"

Summer Precip. ?
0.14" - 2.67"

Coldest Month ?
33.5° F - 57.7° F

Hottest Month ?
58.6° F - 81.2° F

Humidity ?
0.01 vpd - 29.54 vpd

Soil Description
Tolerates a variety of soils

Soil PH
5.0 - 7.0

Soil Toxicity Tolerance
Tolerates Serpentine Soil

Fast, Medium

Cold Tolerance(° F)
Tolerates cold to 5° F

Companion Plants
Can be used with a wide variety of plants requiring full sun and relatively dry conditions, including Manzanita (Arctostaphylos sp.), Ceanothus sp., Sage (Salvia sp.), Yucca (Hesperoyucca whipplei or Yucca shidigera) and various cactus species.

Butterflies hosted ?

Anavitrinella pampinaria Image
Common Gray Anavitrinella pampinariaAnavitrinella pampinaria
Anavitrinella ocularia Image
Anavitrinella oculariaAnavitrinella ocularia

Landscaping Information
Ease of Care
Moderately 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

Inorganic, Organic with Rocks

Propagation ?
For propagating by seed: No treatment; oven heat of 248°F for 5 mins. before sowing nearly doubles germination (Keeley and Keeley 1982).

Nursery Availability
Commonly Available

Other Names
Botanical Names
Helianthemum scoparium

Common Names
Bisbee Peak Rushrose, Broom-rose, Common Sun-rose, Peak Rockrose, Peak Rush-rose

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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