American hornbeam

Sun

Partial shade is ideal; tolerates deep shade and full sun if the soil stays moist.

Water

Moderate to high; prefers consistent moisture and needs watering during prolonged dry spells, particularly while young.

Soil

Moist, humus-rich, well-drained soil, preferably acidic to neutral. Tolerates clay and occasional brief flooding, but avoid permanently waterlogged ground.

Height

20-30 ft (6-9 m)

Spread

20-30 ft (6-9 m)

Flowers

Small greenish catkins in spring; male catkins become yellowish as they shed pollen.

Foliage

Finely toothed, oval green leaves with prominent veins; autumn colour varies from yellow to orange and red.

Growth

Slow

Care needed

Low

• Cold hardy
• Heat tolerant
• Wildlife

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   7 ft (2.2 m)

3. After 2 years

   8 ft (2.3 m)

4. After 3 years

   8 ft (2.5 m)

5. After 5 years

   9 ft (2.9 m)

About 32 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the US and Canada

Growth rate

Slow

• Plant a young, container-grown tree; established trees are difficult to transplant successfully.
• Water deeply through the first two growing seasons whenever the root area begins to dry.
• Spread 2-3 in (5-8 cm) of organic mulch over the root area, keeping it clear of the trunk.
• Water during prolonged drought, especially in sunny positions.
• Avoid routine feeding; use a soil test before adding fertiliser.

Pruning. Prune lightly in late summer to remove crossing branches and establish a sound framework while the tree is young. Remove dead or damaged wood as needed; avoid heavy pruning and late-winter or spring cuts, which can bleed sap.

Early spring

Plant while dormant where the soil is workable, setting the root flare at ground level.

Spring

Refresh the mulch and check that it is not touching the trunk.

Summer

Check soil moisture during dry weather and water deeply rather than sprinkling lightly.

Late summer

Carry out light formative pruning if needed.

Autumn

Plant in mild regions while soil is still warm, and water thoroughly after planting.

Winter

Check young trunks for rubbing, browsing damage and overly tight tree ties.

• Use as an understorey tree beneath tall deciduous trees, with ferns and woodland groundcovers.
• Plant as a small lawn specimen where its fluted trunk can be seen at close range.
• Place beside a shaded path or seating area for summer foliage and autumn colour.
• Include in a moist woodland edge or beside a rain garden, above the area that remains saturated.

Garden styles it suits: Woodland, Wildlife garden, Autumn colour and Winter interest.

Plant it with: Christmas fern, Wild ginger, Foamflower, Virginia bluebells, Solomon's seal and Witch hazel.

Wildlife: Seeds are eaten by birds and small mammals. The foliage feeds several moth caterpillars, and the branching provides shelter and nesting sites for birds.

• Drought stress can cause scorched leaves and early leaf drop; water deeply and mulch the root area.
• Leaf spots sometimes develop in humid weather; clear heavily affected fallen leaves and avoid wetting foliage when watering. Treatment is rarely necessary.
• Cankers can cause branch dieback; prune affected branches back to healthy wood in dry weather and reduce drought or root stress.
• Alkaline soil can cause yellow leaves with green veins; test the soil and seek advice on correcting nutrient availability rather than applying general fertiliser.

Not known to be toxic to people, cats, dogs or horses; no part is recognised as a significant poisoning hazard. It is not normally grown for food.

• Eastern hop-hornbeam (Ostrya virginiana)

  Has rough, shredding bark and hop-like clusters of papery seed sacs; American hornbeam has smooth, fluted bark and seeds attached to leafy, three-lobed bracts.

• European hornbeam (Carpinus betulus)

  Usually becomes a much larger tree and has more conspicuously elongated central lobes on its fruiting bracts. American hornbeam is typically a smaller understorey tree.

• American beech (Fagus grandifolia)

  Has long, sharply pointed buds and leaves with more widely spaced teeth. Its smooth grey trunk lacks the strongly muscle-like fluting of American hornbeam.

Carpinus is the classical Latin name for hornbeam, caroliniana refers to the Carolinas, and the common name musclewood describes the tree's fluted, sinewy-looking trunk.

Propagation. Usually grown from seed. Fresh seed sown outdoors may germinate slowly and unevenly, often needing a warm period followed by winter chilling; some seedlings take a second spring to emerge. Named selections are generally grafted by specialist nurseries.

Accepted botanical name

Carpinus caroliniana

In the US and Canada

Native in Canada and the lower 48 states.

Native range

Alabama, Arkansas, Connecticut, Delaware, Florida, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky and Louisiana.

Measured

Average height 792 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.