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Castanea dentata

American chestnut

Fagaceae eastern North America

Attracts Pollinators Fragrant (strong)

Native to North America

SunFull Sun – Part Shade

WaterMedium

HardinessZones 4–8

Overview

Castanea dentata, the American chestnut, is a deciduous tree in the beech family that was once a dominant canopy species across the eastern North American hardwood forest. Before 1900 mature trees reached 50-100 feet (15-30 m) tall with trunks up to 10 feet (3 m) across, and the species made up an estimated quarter of the hardwoods in parts of the Appalachians. The leaves are 5-8 inches (13-20 cm) long, narrow, and edged with forward-pointing bristle teeth, turning yellow to bronze in autumn. In early summer the tree carries long creamy-white catkins, followed by spiny burs that split to release two or three sweet, edible nuts. An introduced fungal blight, Cryphonectria parasitica, arrived around 1904 and killed nearly all mature trees within fifty years. The species now survives mainly as root collars that resprout, with stems usually girdled by blight before they reach nut-bearing size. Because of this, the plant rarely persists as a full-grown tree in the wild today. Breeding and biotechnology programs are working to restore blight-tolerant trees from surviving stock.

Native Range

Native to eastern North America, historically from Maine and southern Ontario south to Georgia and Alabama and west to the Ohio Valley. It grew on well-drained, acidic slopes and ridges in mixed hardwood forest, reaching its greatest abundance in the southern Appalachians.

Suggested Uses

Historically used for timber, nuts, and shade, and now planted mainly in restoration trials, breeding orchards, and conservation plantings. Grown by enthusiasts and research programs testing blight tolerance.

How to Identify

Recognized by narrow leaves 5-8 inches (13-20 cm) long with widely spaced, forward-curving bristle teeth and a hairless underside. The spiny burs hold two or three flattened nuts. It differs from the introduced Castanea mollissima, Chinese chestnut, which has broader leaves with felted undersides, and from chestnut oaks, which have rounded leaf lobes rather than bristle teeth.

Appearance

Size & Dimensions

Height50' - 100'

Width/Spread40' - 70'

Colors

Flower Colors

Foliage Colors

Fall Foliage Colors

Bloom Information

Bloom Period

~2 weeks

Summer

Creamy-white catkins appear in June and July, after the leaves expand, and are strongly scented. Flowering lasts about two weeks. Burs ripen and drop their nuts in September and October.

Detailed Descriptions

Foliage Description

green, turning yellow to bronze in fall

Growing Conditions

Sun Requirements

SunFull Sun SunPartial Shade

Requires 6-12 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 Range4.5 - 6.5(Acidic)

357912

Soil Types

loam sand rocky

Drainagewell drained

Water & Climate

Water Needs

Medium

Frost Tolerance

hardy

Time to Maturity

fast early growth; historic maturity over many decades

Care & Maintenance

Care Guide

Grows in full sun to partial shade on well-drained, acidic, sandy or loamy soils, and does poorly on wet or limey ground. Young trees grow quickly and resprout vigorously after cutting or dieback. The species is highly susceptible to chestnut blight, which enters through bark wounds and girdles stems, so most plants die back before maturing. Phytophthora root rot also affects trees on heavy, wet soils in the South. Propagation is from seed sown soon after ripening, since the nuts lose viability if they dry out. Blight-resistant nursery stock from breeding programs has a higher long-term survival rate.

Pruning

Little pruning is needed for young trees beyond removing dead or blight-cankered stems. Cankered wood is cut well below the lesion to slow spread. Resprouting stumps can be thinned to one or two leaders if a single trunk is wanted.

✓ Toxicity

Non-toxic