Mountain Whitethorn
Ceanothus cordulatus · Rhamnaceae
- Form
- Shrub
- Height
- 2–5 ft
- Sun
- Full Sun
- Water
- Very Low
- Blooms
- May, Jun, Jul
- Habitat
- Montane
🌿 California native
Quick facts
- Habitat: Montane conifer forest openings and burns
- Form / size: Low, dense, spiny shrub, 2–5 ft
- Sun: Full sun · Water: Very low
- Blooms: Early summer — frothy white · Pollinator value: High
Description
A low, dense, intricately branched mountain ceanothus armed with stiff, pale, rigid spines (the “whitethorn”), with small grey-green leaves and a flush of frothy white flowers in early summer. Forms wide, snow-flattened thickets in conifer-forest openings — important cover and a nitrogen-fixer that helps forests recover after fire.
Wildlife & pollinators
White flowers swarm with native bees and butterflies; foliage is deer browse; thickets shelter quail and small wildlife; fixes nitrogen.
Habitat & range
Montane conifer forest, openings, and burns of the Sierra and higher SoCal mountains (around Big Bear).
In the garden
A tough, fragrant, pollinator-rich shrub for cold, sunny mountain gardens; the spines make it a good barrier. Full sun, very low water.
Propagation
From seed (hot-water + smoke/heat fire-cue) or semi-hardwood cuttings — typical of Ceanothus. See Propagation Basics.
Where to see it near you
- iNaturalist — observed across California (map)
- Forest openings around Big Bear and the Eastern Sierra.
