When does Ceanothus oliganthus bloom?

Hairy ceanothus generally flowers from March through May, producing rounded clusters of blue to lavender blooms.

What pollinators visit Ceanothus oliganthus?

Bees and butterflies are the main visitors, drawn to the nectar and pollen produced by the shrub's spring flower clusters.

How much water does Ceanothus oliganthus need?

This shrub is adapted to low water conditions and performs best with infrequent irrigation once established, reflecting its dry chaparral habitat.

What light does Ceanothus oliganthus prefer?

It grows best in full sun but can tolerate some light shade, especially along woodland margins.

What growth habit does Ceanothus oliganthus have?

It is a woody, evergreen shrub with a dense, rounded to spreading form typical of chaparral shrubs.

Is Hairy Ceanothus HOA-friendly?

Hairy Ceanothus is generally an HOA-friendly choice in the right placement, with low maintenance.

Hairy Ceanothus

Name: Pollinator Patch
Author: Pollinator Patch

Ceanothus oliganthus

Last reviewed: September 2026

Ceanothus oliganthus, or hairy ceanothus, is an evergreen shrub of California chaparral and oak woodland edges, producing clusters of blue to lavender flowers from March through May.

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

Pollinators

bees, butterflies

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Browse plants for this ecoregion

Coast Range Central California Foothills and Coastal Mountains Southern California Mountains Southern California/Northern Baja Coast

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 variable checkerspot, 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 generally flowers from March through May, producing rounded clusters of blue to lavender blooms.
What pollinators visit Ceanothus oliganthus?: Bees and butterflies are the main visitors, drawn to the nectar and pollen produced by the shrub's spring flower clusters.
How much water does Ceanothus oliganthus need?: This shrub is adapted to low water conditions and performs best with infrequent irrigation once established, reflecting its dry chaparral habitat.
What light does Ceanothus oliganthus prefer?: It grows best in full sun but can tolerate some light shade, especially along woodland margins.
What growth habit does Ceanothus oliganthus have?: It is a woody, evergreen shrub with a dense, rounded to spreading form typical of chaparral shrubs.
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.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

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