Hairy Ceanothus
Ceanothus oliganthus
Last reviewed: July 2026
Ceanothus oliganthus (Hairy Ceanothus) is a drought-tolerant California native shrub that blooms white flowers from March to May. This low-water plant attracts bees and butterflies in sunny garden locations.
Hairy Ceanothus (Ceanothus oliganthus) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org (opens in new tab), last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
full sun
Water
low
Size
24"–120" H × 24"–96" W
Bloom
Mar, Apr, May
Native to
CA
Pollinators
bees, butterflies
Browse plants for this ecoregion
Hairy ceanothus is a native evergreen shrub with small blue to purple flower clusters that bloom in spring. It features dense foliage with leathery, dark green leaves and can grow 2-10 feet tall, creating an attractive year-round presence in the landscape.
Growing Hairy Ceanothus
Grow Hairy Ceanothus in full sun and low water. Mature plants reach 24 to 120 inches tall and spread 24 to 96 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
Hairy Ceanothus is an HOA-friendly choice. Maintenance level: low. Tidiness: 3 out of 5.
Works well in: foundation, mid zone.
- Can look somewhat wild/informal if not occasionally pruned
- Size must be managed in smaller spaces
- May appear less manicured than non-native ornamentals
Wildlife value
Host plant for Chalcedon checkerspot butterfly, California hairstreak.
This shrub provides excellent habitat and food resources for native bees and butterflies. The spring blooms are particularly valuable for early-season pollinators.
Common questions
- When does Ceanothus oliganthus bloom?
- Hairy Ceanothus blooms from March through May, producing clusters of small white flowers that attract pollinators.
- What pollinators visit Hairy Ceanothus?
- Ceanothus oliganthus attracts bees and butterflies during its spring blooming period. The flowers provide nectar for various native bee species.
- Where is Ceanothus oliganthus native?
- Hairy Ceanothus is native to California, where it grows naturally in chaparral and woodland habitats.
- How much water does Hairy Ceanothus need?
- This California native requires low water once established and is well-adapted to drought conditions. Overwatering can be harmful to the plant.
- Is Hairy Ceanothus toxic to dogs?
- Hairy Ceanothus is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
- Is Hairy Ceanothus toxic to cats?
- Hairy Ceanothus is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
- Is Hairy Ceanothus HOA-friendly?
- Hairy Ceanothus is generally an HOA-friendly choice in the right placement, with low maintenance.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow Hairy Ceanothus? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz