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Aesculus spp.

buckeyes and horse-chestnuts

Sapindaceae

Temperate North America, southeastern Europe, and eastern Asia

Attracts Pollinators Attracts Butterflies Attracts Hummingbirds

Native to North America

SunFull Sun – Part Shade

WaterMedium

HardinessZones 3–8

Overview

Aesculus spp. is a genus of about 13 to 19 species of deciduous trees and shrubs in the soapberry family, Sapindaceae, native to the temperate Northern Hemisphere across North America, southeastern Europe, and eastern Asia. Tree species reach 50–100 ft (15–30 m) tall, while shrubby species such as A. parviflora stay 8–12 ft (2.4–3.7 m). The leaves are opposite and palmately compound, with five to nine leaflets spreading from a single point like the fingers of a hand, each leaflet 3–10 in (7.5–25 cm) long. In spring, upright branched flower clusters (panicles) 4–12 in (10–30 cm) tall rise above the foliage, with flowers in white, cream, yellow, pink, or red. The fruit is a leathery, sometimes spiny capsule 1–3 in (2.5–7.5 cm) across that splits to release one to three glossy brown seeds marked with a pale scar. All parts, especially the seeds, contain aesculin and related glycosides that are toxic to people and animals if eaten. Many species drop their leaves early in dry late summers, and some are prone to leaf blotch and scorch. The genus grows in moist woodland, valley bottoms, and stream banks.

Native Range

Aesculus spp. is native across the temperate Northern Hemisphere. North American species include Ohio buckeye A. glabra, red buckeye A. pavia, and California buckeye A. californica. The horse-chestnut A. hippocastanum is native to the Balkans, and several species are native to China and Japan.

Suggested Uses

Aesculus spp. tree species are grown as shade and avenue trees in parks and large gardens, while shrubby species are used in borders and woodland edges. Red-flowered species are planted to draw hummingbirds. The seeds and wood have been used for carving, starch, and folk crafts.

How to Identify

Identify Aesculus spp. by opposite, palmately compound leaves with five to nine leaflets radiating from one point, a pattern uncommon among temperate trees. Large upright panicles of flowers stand above the canopy in spring, followed by leathery capsules holding glossy brown seeds. Winter buds are large, often sticky in the horse-chestnut. The compound palmate leaf and husked seed separate Aesculus spp. from maples, which have simple lobed leaves and winged fruit.

Appearance

Size & Dimensions

Height8' - 100'

Width/Spread8' - 70'

Reaches mature size in approximately 25 years

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~3 weeks

Spring

Most Aesculus spp. species flower in mid to late spring, roughly April to June, as the leaves expand. The upright flower panicles last 2 to 3 weeks and are followed by developing capsules through summer. Red-flowered species such as A. pavia draw hummingbirds, while white-flowered species such as A. hippocastanum are visited mainly by bees. Flower color ranges from white and cream to yellow, pink, and red across the genus.

Detailed Descriptions

Flower Description

white, cream, yellow, pink, or red

Foliage Description

green

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 4-8 hours of direct sunlight daily

• Full Sun: 6+ hours of direct sunlight

• Partial Shade: 3-6 hours of direct sunlight

• Full Shade: Less than 3 hours of direct sunlight

Soil Requirements

pH Range6.0 - 7.5(Neutral)

357912

Soil Types

loam clay

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

Reaches mature size in 20–40 years for tree species.

Care & Maintenance

Care Guide

Aesculus spp. species grow in full sun to part shade in deep, moist, well-drained soil with a pH around 6.0 to 7.5. Most need steady moisture and show early leaf drop, scorch, or blotch in hot, dry summers. Plants are hardy across USDA zones 3 to 8 depending on the species and need little feeding in reasonable soil. They develop deep roots and are difficult to move once established, so they are planted young. Fallen leaves, flowers, and seeds drop heavily and litter the ground beneath. Seeds germinate readily where they fall and produce seedlings around mature trees.

Pruning

Aesculus spp. species need little pruning beyond removing dead, damaged, or crossing branches in late winter. Lower limbs of tree species can be raised gradually to lift the canopy. Shrubby species such as A. parviflora are thinned of old stems after flowering to renew the clump.