Ceanothus spinosus

Sale price Price $9.00 Regular price

Ceanothus spinosus is a species in the Rhamnaceae (Buckthorn) family known by the common names greenbark ceanothus and redheart. It is native to the coastal strip of southern California south of San Luis Obispo County to northern Baja California, where it grows in the scrub and chaparral of the coastal mountain ranges. This is a large treelike shrub approaching six meters in maximum height. The stem is a rough-barked trunk near the base and has thorny, greenish-brown branches. The thick, firm evergreen leaves are up to 4 or 5 centimeters long and are hairless on the upper surface but sometimes lined with hairs underneath. The shrub blooms in flower clusters up to 15 centimeters long filled with clusters of white to pale blue flowers. The fruit is a smooth, round capsule about half a centimeter wide containing 3 seeds.
Plant Description
Plant Type
Max. Height
10 - 20 ft (3 - 6.1 m)
Max. Width
10 ft (3.0 m)
Fragrant - Pleasant
Summer Semi-Deciduous, Evergreen
Flower Color
Blue, White
Flowering Season
Native Status
Natural Setting
Site Type
Dry slopes of the western face of the Coast Ranges, Transverse Range and Peninsular Range, usually below 3,000 ft.
Elevation ?
1' - 6180'
Annual Precip. ?
7.5" - 36.1"
Summer Precip. ?
0.14" - 1.99"
Coldest Month ?
40.1° F - 56.1° F
Hottest Month ?
64.0° F - 83.5° F
Humidity ?
0.72 vpd - 33.74 vpd
Soil Description
Tolerates a variety of soils
Soil PH
6.0 - 7.0
Fast, Medium, Slow
Cold Tolerance(° F)
Tolerates cold to 5° F
Sunset Zones ?
7, 8, 9, 14*, 15*, 16*, 17*, 18, 19*, 20*, 21*, 22*, 23*, 24*
Wildlife Attracted
Numerous insects, especially bees, are attracted to the flowers. Birds and small mammals are attracted to the fruits. Plants in the Ceanothus genus are host plants to the Spring Azure, Echo Blue, Pacuvius Duskywing, California Tortoiseshell, Pale Swallowtail, and Hedgerow Hairstreak butterflies.