California Buckeye
Aesculus californica
Last reviewed: September 2026
California Buckeye is a small deciduous tree with upright clusters of white to pale pink flowers in May and June, often dropping its leaves by mid-summer in response to drought. It thrives in full sun on dry slopes and open woodland edges with hot, dry summers.
California Buckeye is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (opens in new tab) (last reviewed 2026-05-21). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435and your veterinarian's emergency line.
Pollinator Patch flags toxic plants so you can choose a pet-safe native alternative for your yard.
California Buckeye is listed as toxic to grazing livestock (cattle, sheep, and goats) at a severe level by the USDA PLANTS Database (opens in new tab). This is a livestock indicator and is separate from pet toxicity.
Light
full sun
Water
low
Size
180"–360" H × 180"–360" W
Bloom
May, Jun
Native to
CA
Pollinators
bees, butterflies, moths
Before you buy
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A dramatic deciduous tree with attractive white flower spikes in spring and distinctive round fruits in summer. It goes dormant and drops leaves in late summer as a drought adaptation, revealing its architectural branching structure through winter.
Growing California Buckeye
Grow California Buckeye in full sun and low water. Mature plants reach 180 to 360 inches tall and spread 180 to 360 inches wide. Expect moderate maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
California Buckeye is an HOA-friendly choice in the right placement. Maintenance level: moderate. Tidiness: 3 out of 5.
Works well in: backyard only, mid zone.
- Summer dormancy leaves tree leafless when other plants are green
- Dropping fruits can create maintenance issues on hardscapes
- Large mature size requires adequate spacing
Wildlife value
Host plant for Western Tiger Swallowtail.
The showy flower clusters attract bees, butterflies, and moths. However, the nectar can be toxic to honey bees in some circumstances.
Common questions
- When does California Buckeye bloom?
- California Buckeye typically flowers in May and June, producing large upright clusters of white to pale pink blossoms.
- What pollinates California Buckeye flowers?
- Bees, butterflies, and moths are the main visitors to California Buckeye flowers, drawn to the nectar and pollen produced during the spring bloom.
- Does California Buckeye need regular watering once established?
- No. Once established, California Buckeye tolerates low water conditions and is well suited to dry, well-drained sites that get little summer moisture.
- Why does California Buckeye lose its leaves in summer?
- California Buckeye is deciduous and often drops its leaves by mid to late summer as a way to conserve water during dry, hot conditions, well before most other trees begin fall color change.
- Is California Buckeye toxic to dogs?
- Yes. California Buckeye is listed as toxic to dogs by the ASPCA Animal Poison Control Center (aspca.org). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.
- Is California Buckeye toxic to cats?
- Yes. California Buckeye is listed as toxic to cats by the ASPCA Animal Poison Control Center (aspca.org). If your cat has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435.
- Is California Buckeye toxic to livestock?
- California Buckeye is listed as toxic to grazing livestock such as cattle, sheep, and goats (severe severity) by the USDA PLANTS Database. This is separate from pet (dog and cat) toxicity.
- Is California Buckeye HOA-friendly?
- California Buckeye is generally an HOA-friendly choice in the right placement, with moderate 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.
- It is dying right after planting
- Leaves turning yellow
- Wilting even though I watered it
- Brown crispy leaf tips
- Bugs on the plant
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