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Ceanothus rigidus
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Monterey Ceanothus
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Ceanothus rigidus
  

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About Monterey Ceanothus (Ceanothus rigidus) Monterey Ceanothus (Ceanothus rigidus previously called Ceanothus cuneatus var. rigidus) is a rare native shrub that grows in Northern, Southern and Central California, primarily in the Central Coast and SF Bay regions. It tends to grow in dry fans, slopes and ridges, at elevations from 0-5900 feet.

Ceanothus rigidus is primarily available in nurseries as cultivars - the two most common of which are Ceanothus rigidus 'Snowball', and Ceanothus rigidus'' 'Sierra Snow'. Both have profuse white flowers, and a dense form with arching branches the former of The Snowball variety ranges from 4-5 high and 8 feet wide, and Sierra Snow ranges from 5-6 feet high and 10-15 feet wide. Both are relatively easy to grow in the natural coastal range of the straight Ceanothus rigidus species.
Plant Description
Plant Type
Shrub

Max. Height
4 - 6 ft (1.2 - 1.8 m)

Max. Width
5 - 15 ft (1.5 - 4.6 m)

Form
Mounding, Rounded, Spreading

Growth Rate
Moderate

Dormancy
Evergreen

Leaves
Shiny, dark green, serrated, hollylike, pointed at the stem and widest at the end

Flower Color
Blue, Purple, White

Flowering Season
Spring, Winter
Spring
Summer
Fall
Winter


Native Status
Natural Setting
Site Type
Dry fans, slopes, ridges

Sun
Sun

Elevation ?
-14' - 6772'

Annual Precip. ?
10.1" - 61.8"

Summer Precip. ?
0.17" - 1.70"

Coldest Month ?
33.7° F - 56.4° F

Hottest Month ?
54.8° F - 77.5° F

Humidity ?
0.50 vpd - 23.53 vpd

Soil Description
Adaptable

Drainage
Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to 15 - 25° F

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

Wildlife Attracted
Native bees, butterflies, other pollinators

Landscaping Information
Ease of Care
Moderately Easy

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


Popularity
Moderately Popular

Max. Summer Water ?
No Summer Water, 1x/month
No Summer Water
1x/month
2x/month
3x/month
1/week
Keep moist


Mulch
Organic with Rocks

Propagation ?
For propagating by seed: Hot water treatment.

Common uses
Bank Stabilization, Hedges, Deer Resistant, Bird Gardens, Butterfly Gardens, Bee Gardens

Nursery Availability
Commonly Available

Other Names
Botanical Names
Ceanothus cuneatus var. rigidus


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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