How much water does California Buckthorn need?

California Buckthorn does well with low water once it is established, tolerating dry summers typical of chaparral and woodland climates in the western United States.

What light conditions suit California Buckthorn best?

This shrub grows well in part sun and can also handle brighter, fuller sun exposure or somewhat shadier part shade spots, depending on local heat and moisture.

When does California Buckthorn bloom?

California Buckthorn typically flowers from April through June, producing small, inconspicuous blossoms.

Do pollinators visit California Buckthorn flowers?

Yes, its blooms attract bees and butterflies, which visit for nectar during the spring bloom period.

Is California Buckthorn HOA-friendly?

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

California Buckthorn

Name: Pollinator Patch
Author: Pollinator Patch

Rhamnus californica

Last reviewed: September 2026

California Buckthorn is an evergreen shrub that thrives in chaparral, woodland, and canyon settings across the dry West, blooming from April through June with small greenish flowers.

California Buckthorn (Rhamnus californica) 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

part sun

Water

low

Size

48"–180" H × 48"–120" W

Bloom

Apr, May, Jun

Native to

AZ, CA, NM, NV and 1 more states

Pollinators

bees, butterflies

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 452 programs across 44 states, each with a link to the provider and the date we last checked it.

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Browse plants for this ecoregion

Coast Range Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Southern California Mountains Mojave Basin and Range Arizona/New Mexico Mountains Madrean Archipelago Southern California/Northern Baja Coast

Buckthorn is an attractive evergreen shrub with glossy oval leaves and small white flowers in spring. It produces red berries that mature to black in fall, creating year-round visual interest. This drought-tolerant native adapts well to various garden settings.

Growing California Buckthorn

Grow California Buckthorn in part sun and low water. Mature plants reach 48 to 180 inches tall and spread 48 to 120 inches wide. Expect low maintenance to keep it looking intentional in a front yard.

In an HOA neighborhood

California Buckthorn is an HOA-friendly choice. Maintenance level: low. Tidiness: 4 out of 5.

Works well in: front yard, foundation, street edge, mid zone.

Can get leggy without occasional pruning

Wildlife value

Host plant for pale swallowtail butterfly, echo blue butterfly.

This shrub supports local ecosystems by attracting bees and butterflies during its spring bloom period. The berries provide important food for birds and other wildlife in fall and winter.

Common questions

How much water does California Buckthorn need?: California Buckthorn does well with low water once it is established, tolerating dry summers typical of chaparral and woodland climates in the western United States.
What light conditions suit California Buckthorn best?: This shrub grows well in part sun and can also handle brighter, fuller sun exposure or somewhat shadier part shade spots, depending on local heat and moisture.
When does California Buckthorn bloom?: California Buckthorn typically flowers from April through June, producing small, inconspicuous blossoms.
Do pollinators visit California Buckthorn flowers?: Yes, its blooms attract bees and butterflies, which visit for nectar during the spring bloom period.
Is California Buckthorn toxic to dogs?: California Buckthorn is not on the ASPCA Animal Poison Control Center toxic plant list for dogs (aspca.org).
Is California Buckthorn toxic to cats?: California Buckthorn is not on the ASPCA Animal Poison Control Center toxic plant list for cats (aspca.org).
Is California Buckthorn HOA-friendly?: California Buckthorn 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 the World Checklist of Vascular Plants (Kew). 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

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