1 named cultivar

‘Autumn Splendor’Autumn Splendor Buckeye

treeN. America Native

Buckeye

The Story

Plant Bio

Aesculus x arnoldiana, Arnold buckeye, is a broad rounded deciduous tree raised at the Arnold Arboretum in Massachusetts, reaching fifteen to thirty-five feet. Palmate compound leaves give the coarse texture typical of buckeyes, and upright panicles of tubular yellow flowers open in spring, followed by the smooth-husked nuts.

It is a garden hybrid rather than a wild species, raised from North American buckeyes, and it inherits their better disease resistance — buckeyes generally hold cleaner foliage than the European horse chestnuts they resemble. Like all Aesculus the seeds are toxic if eaten, and a mature tree drops a great many onto whatever lies below.

Uses & Benefits:

Upright panicles of yellow tubular flowers in spring on a broad, well-proportioned crown.

Better disease resistance than European horse chestnut, at a more manageable size.

Bees and hummingbirds work the flowers, and small mammals take the fallen nuts.

Essentials

At a Glance

Plant Type

Tree

Height

300 inches

Width

300 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8

Water

Moderate

Humidity

Moderate

Lifespan

Perennial

Native To

Garden hybrid of North American buckeyes

Toxicity

Seeds are toxic if eaten

Planting

How to Grow

Allow twenty-five feet or more of spread.
Plant in full sun to partial shade in moist soil.
Keep it clear of paths, drives and play areas.
Water deeply through the first few summers.
Mulch the root zone, keeping mulch off the trunk.
Prune only to remove dead or crossing wood.

Pro Tip

Buckeyes hold cleaner foliage than horse chestnuts, so if leaf scorch has put you off the latter this is the better bet.

Keep It Thriving

Care Guide

Do

Allow it twenty-five feet of spread 📏
Site it clear of paths and drives 🚶
Mulch the root zone in spring 🍂
Water deeply while establishing 💧

Don't

Plant it over a patio or play area ❌
Let anyone eat the nuts ❌
Prune it heavily ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Clear
Mulch

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Medium shade tree for a lawn or parkSpring flowering specimenStreet planting where space allows

Companion Plants

Daffodil Hellebore Wood Anemone Hosta Epimedium

Multiply

Propagation Methods

Good to Know

Common Questions

Buckeye questions

What zones can Buckeye grow in?

Buckeye is hardy in USDA Zones 4–8. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Buckeye deer resistant?

Yes — Buckeye is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Buckeye bloom?

Buckeye typically blooms in late spring through early summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Buckeye need full sun?

Buckeye does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Buckeye drought tolerant?

Yes — once established (usually after the first full season), Buckeye handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.