Red horse chestnut

Appalachian-Blue Ridge forests

Arizona Mountains forests

Atlantic coastal pine barrens

Blue Mountains forests

Central Pacific Northwest coastal forests

Central Tallgrass prairie

Central-Southern Cascades Forests

Chilean Matorral

Colorado Rockies forests

A medium-to-large native shade tree of central and eastern North America, reaching 50 to 80 feet with an ovate-rounded crown and large, asymmetric heart-shaped leaves. In June it carries pale-yellow, intensely fragrant flowers on pendulous cymes - each cluster hung from a distinctive strap-like leafy bract - that ripen into pea-sized nutlets. The fragrant June bloom is a premier nectar source: Missouri Botanical Garden lists it as attracting bees and butterflies, and the Lady Bird Johnson Wildflower Center flags it as having special value to both native and honey bees.

What it needs

Conditions

Light

Full sun / Part shade

Water

Consistent moisture

Spacing

25 ft

Habit

Medium deciduous flowering shade tree with a dense, pyramidal-to-rounded crown

Care tips

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Choose it over the common horse chestnut specifically for its cleaner foliage: it largely escapes the leaf blotch and late-summer scorch that disfigure A. hippocastanum, so the canopy looks better all season.

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Keep it consistently moist - this is a tree that dislikes drought; water deeply through dry summers, especially while it is young, rather than counting on toughness.

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Site it deliberately around children and pets: the smooth brown conkers and other parts are toxic, look deceptively like edible chestnuts, and drop in autumn along with spiny capsules.

Lifecycle

Planting

Plant in full sun to part shade in moist, fertile, well-drained soil; red horse chestnut prefers consistent moisture and resents drought and prolonged dry spells. Give it room for a 25-35 foot spread, and site it with care around patios, drives, and play areas because it drops spiny capsules and toxic conkers in autumn.

Transplanting

Transplants best balled-and-burlapped or from containers while dormant in late winter to early spring; set at the original depth and water deeply through the first seasons to establish the root system.

Early growth

Growth is moderate. Keep young trees evenly watered and mulched (mulch held off the trunk) through dry summers, train to a single central leader, and remove any competing or crossing branches while the framework is forming.

Maturity

Matures to roughly 30 to 40 feet tall and 25 to 35 feet wide with a dense, rounded crown. Its standout trait shows here: it largely escapes the leaf blotch fungus and the late-summer leaf scorch that brown and disfigure the common horse chestnut, so a mature red horse chestnut keeps a cleaner canopy through the season. Seed set is light, so autumn conker drop is modest compared with A. hippocastanum.

Propagation

Because it is a hybrid, it does not come true from seed; named selections are budded or grafted onto Aesculus rootstock to stay uniform. The few seeds it sets must not dry out and need cold stratification, but grafting is the standard route to a known plant.

Similar plants

Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.

Tilia americana

American basswood

The only native U.S. holly with both spiny green leaves and bright red berries - an upright, pyramidal, broadleaf evergreen tree that slowly matures to 15 to 30 feet in cultivation (to 50 feet in the wild). Thick, leathery, deep green leaves bear spiny marginal teeth, and pollinated female trees carry showy red-to-orange drupes that ripen in fall and persist through winter as bird food. This is the classic "Christmas holly" of wreaths and decorations.

A tough, medium-sized native tree of the eastern and midwestern United States, grown as much for its showy edible orange fruit as for its distinctive thick, dark gray bark broken into rectangular blocks. Small urn-shaped white-to-greenish-yellow flowers open in May and June, and the sweet fruit ripens after frost. Largely dioecious - a female tree needs a male pollinizer nearby to set fruit - and notably drought- and walnut-tolerant once established.

A small native deciduous tree (or thicket-forming, suckering shrub) of eastern and central North America, grown for clouds of fragrant white 5-petaled flowers that open in March before the leaves and for the edible red plums that follow in early summer. It forms a broad, spreading crown with attractive dark reddish-brown twigs that sometimes carry thorny lateral branchlets. A documented larval host for swallowtails and other butterflies, with flowers of special value to native, bumble, and honey bees.

The largest native cherry of eastern North America - a medium-to-large deciduous shade tree that hangs elongated racemes of small white flowers in spring, then ripens drooping strings of pea-sized fruit from red to near-black in late summer. The fragrant white bloom feeds bees while the fruit is eaten by 33 species of birds and many mammals; it is also a workhorse larval host, supporting the Eastern Tiger Swallowtail and a string of giant silk and sphinx moths. Every part except the ripe fruit is cyanide-bearing and toxic.

Full sun / Part shade

A unique native shrub or small tree of eastern North American woodland margins, producing fragrant yellow strappy-petaled flowers in October through December when nothing else is blooming - the only North American native pollinated primarily by noctuid moths in cold weather. Yellow fall foliage doubles as background to the late-season bloom. Host for the witch hazel dagger moth (Acronicta hamamelis) larvae.