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Ray Hartman Ceanothus
Ceanothus 'Ray Hartman'

About Ray Hartman Ceanothus (Ceanothus 'Ray Hartman') Ray Hartman Ceanothus is a cultivated hybrid of Ceanothus arboreus and Ceanothus griseus. It originated by chance in 1929 at the Leonard Coates Nurseries in Morgan Hill, CA, and is now widely grown in nurseries throughout California. It has dark green glossy leaves, and grows quickly up to 15 feet in height and 10 feet in width. Its blue flowers range from powder blue to dark blue.

Ray Hartman Ceanothus is one of the easiest to grow of all the Ceanothus cultivars in California. In general, it's best to grow Ceanothus species native to your area. Ray Hartman Ceanothus may be the exception that proves the rule. While its parents are native to the channel islands and the coast of north-central california, it grows reliably throughout the state in both coastal and interior areas, as long as temperatures stay above 10-15 degrees, It tolerates fairly dry soil and naturalizes well in areas with just a little more than average soil moisture during the dry season, such as slope bottoms and north facing slopes. It also tolerates supplemental irrigation up to once per week, though still better not to water directly during the summer or early fall once established or it'll likely have a shortened life. It will get all the water it needs as it stretches it's roots out to nearby irrigated areas.

The biggest problem with this plant is that deer love it. Rats also seem to be attracted to this plant and can strip smaller branches and shoots to make their nests.
Plant Description
Plant Type

Max. Height
15 - 30 ft (4.6 - 9.1 m)

Max. Width
5 - 10 ft (1.5 - 3 m)



Growth Rate


Dark glossy green

Flower Color

Flowering Season
Spring, Winter

Native Status
Nursery Cultivar

Site Characteristics
Part Shade, Sun

Soil Description
Tolerates a wide variety of soils, including loam, light clay and sand.

Soil PH
5 - 6

Cold Tolerance(° F)
Tolerates cold to 10 - 15° F

Sunset Zones ?
5*, 6*, 7*, 9*, 14*, 15*

Wildlife Attracted
Bees, deer

Landscaping Information
Ease of Care
Moderately Easy

Water Requirement ?
Extremely Low
Very Low
Moderate - High

Very Popular

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

Inorganic, Organic with Rocks

Tolerates light pruning

Common uses
Butterfly Gardens, Hedges

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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