Ceanothus oliganthus, Hairy Ceanothus


1 gallon pot
Plant Type: Shrub
Size: 10 ft tall x 12 ft wide
Form: Mounding
Growth Rate: Moderate
Dormancy: Evergreen
Fragrance: Fragrant – Pleasant
Flower Color: Blue, Purple
Flowering Season: Winter, Spring

Landscaping Information:
Full Sun
Very Low Moisture
Summer Irrigation: Max 1x / month once established
Ease of Care: Moderately Easy
Cold Tolerance: Tolerates cold to 15° F
Soil Drainage: Fast, Medium
Soil Description: Tolerates both heavy and sandy soils. Soil PH: 6.0 – 8.0

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

Companion Plants: Purple Sage (Salvia leucophylla), Sticky Monkeyflower (Mimulus aurantiacus), California Sagebrush (Artemisia californica), Deerweed (Lotus scoparius), Brittlebush (Encelia species), Sage (Salvia species), Manzanita (Arctostaphylos species), Oaks (Quercus species), Lodgepole Pine (Pinus contorta), Ponderosa Pine (Pinus ponderosa), Red Fir (Abies magnifica), Yucca species, native grasses, and Dudleya species

For propagating by seed: Hot water treatment.

Site Type: Rocky, dry slopes below 4,500 ft. most often along the coastal side of the mountains, frequently on north facing aspect, from Humboldt County to San Diego

Climate: Annual Precipitation: 5.1″ – 154.9″, Summer Precipitation: 0.15″ – 2.96″, Coldest Month: 38.3″ – 55.3″, Hottest Month: 60.0″ – 82.9″, Humidity: 0.05″ – 33.83″, Elevation: 3″ – 6541″

7 in stock



Ceanothus oliganthus is a species of shrub in the buckthorn family Rhamnaceae known by the common name hairy ceanothus. It is endemic to California, where it can be found in most of the coastal mountain ranges in dry habitat such as chaparral. This is a large, erect shrub approaching 3 meters in maximum height. The evergreen leaves are alternately arranged and may be up to 4 centimeters long. They are dark green on top, paler and hairy on the underside, and are edged with hairy teeth. The flower cluster is a cluster or series of clusters of blue or purple flowers. The fruit is a capsule which may be hairy or not, depending on variety. There are three recognized varieties with different ranges. The variety of this species known as jim brush (var. sorediatus) is sometimes treated as a separate species.

Plant Ceanothus oliganthus on rocky slopes, particular north facing ones in the southern, drier parts of its range. This plant is fairly sensitive to summer water. Best to avoid all direct summer water after its first year, though it will be happiest if it can stretch its roots out to a damper or irrigated area 10 feet away or so. This plant likes full sun but tolerates part shade.

View Calflora for more information

Pick -up of purchased plants will be Saturday, July 25, from 9-11 am at the CNPS pick-up location off of Broad St in San Luis Obispo. (Note: there is no actual address for this location. It is at the East end of Francis Street in San Luis Obispo, behind Rizzoli’s Auto Repair. Please park on Francis St. while picking up plants.) A sign will be posted on the street. GPS coordinates for Pick-up location: Lat: 35.266967 degrees, Long: -120.651302 degrees. Please only place your order if you are able to pick up your plants on July 25 between 9 and 11 am. There are no options for other pickup times or dates, or shipping of these live plants.