American Hornbeam
Carpinus caroliniana · Deciduous, Broadleaf, Hardwood
Plant Family
Betulaceae
Tree Category
Understory Tree, Ornamental, Shade Tree
Variety / Cultivar
Native species (unspecified cultivar)
Hardiness Zones
USDA Hardiness Zones 3 through 9.
About This Tree
A slow-growing, small to medium-sized tree with a unique rounded to spreading habit. It is famous for its extremely hard wood and distinctive 'muscular' trunk ripples. The crown is typically dense and bushy with elegant, horizontal branching.
Leaf Characteristics
Simple, alternate, ovate-oblong leaves (2-5 inches long). They feature double-serrated margins, prominent parallel veins, and a dark green color that turns vibrant shades of yellow, orange, or red in autumn.
Bark Characteristics
Distinctive smooth, steel-gray bark that is tight and fluted. The ridges resemble flexed muscles, giving it the common names 'Musclewood' or 'Ironwood'. Does not peel with age.
Growing Information
Origin Region
Eastern Northern America, from Ontario to Florida and west to Texas.
Growing Season
Leafs out in early spring; flowers (catkins) appear shortly after leaves; seeds ripen in late summer or fall; enters dormancy after shedding orange-red fall foliage.
Sunlight & Water Needs
Partial Shade to Full Sun; prefers moist, well-drained, acidic soils. It is moderately drought-tolerant once established but performs best with consistent moisture.
Mature Size
Height: 20-35 feet; Spread: 20-35 feet. Growth rate is slow. Typical lifespan is 50-150 years.
Special Characteristics
Highly resistant to most pests and diseases; extremely heavy and hard timber (historically used for tool handles); exceptional fall color; excellent for heavy shade areas in urban landscapes.
Wildlife & Ecology
Provides seeds (nutlets) for songbirds, ruffed grouse, and small mammals like squirrels. It is a larval host for several butterfly species, including the Eastern Tiger Swallowtail and Red-spotted Purple.