What is an American Hornbeam Tree? - Home Stratosphere

What is an American Hornbeam Tree?

Learn more about the charming American hornbeam tree, its characteristics, uses, and subspecies. We've also included some faqs that might interest you.

We are so incredibly lucky in North America for all the incredible native plants that occur here. Although this does occur everywhere on the planet, there is something special about walking down the street and recognizing a vast number of plant and tree species in the area.

Are you interested in becoming a plant and tree identification expert? Head on over to 101 Types of Trees from around the world to get yourself started. In the meantime, keep scrolling to learn about carpinus caroliniana, a tiny yet beautiful tree that will bring charming ornateness to any property.

Carpinus Caroliniana

Part of the genus Carpinus and the Betulaceae family, the American hornbeam is a small hardwood tree. It is a deciduous, understory tree that is native to the Chicago area. They are usually used as landscape and street trees because they are small, easily maintained, and very attractive.

They are sometimes referred to as a “blue beech” tree because they greatly resemble a small version of a beech tree, but with blue-ish/gray bark. They are also known to be called “musclewood” because their wood is incredibly strong, flexible, and close-grained — like muscle fibers.

American hornbeams are long-lived, and can sometimes exceed 300 years (this puts them in the old-growth category) They are rather slow-growing, never usually exceeding 12 inches in height per year. They will grow as either a single-trunked tree and or a multi-trunked shrub.

What do American Hornbeam Trees Look Like?

Roots

Starting with what occurs below the soil, the American hornbeam possesses a rather shallow root system. Because they only grow in regions that are high in humidity and high in annual precipitation, their roots will grow in shallow soil, laterally, and in a wide-spreading manner.

Dimensions

American hornbeams are small trees, so small that they are sometimes considered as being shrubs. They are often planted close together to create a natural barrier. They usually grow to be between 10-15 meters in height, with rather narrow trunks that grow in a crooked manner. Thick branches begin to grow rather close to the base, resembling multiple trunks.

Bark

Along the trunk grows very smooth bark. In young trees, the bark is a beautiful blue-gray color, this is how they are most easily recognized. In older trees, the bark will begin to furrow near the base and blend into shallow fissures along the length of the trunk.

Foliage

Spring leaves of an American hornbeam tree.

Small branchlets that grow from the main hearty branches, will first sprout out as a pale green color, which will then fade into a reddish-brown color. Once they’ve reached full maturity, they will become dark gray. Petioles that grow from the branchlets are short, hairy, and thin.

At the ends of twigs, there will grow leaves that are alternately arranged and are anywhere between 2 and 5 inches in length. The most distinct feature of hornbeam leaves is their veins. When leaves first emerge, they are decorated with bright red-orange veins. These veins give the leaves a corrugated texture.

The leaves themselves will sprout as a stunning purple color, which eventually grows into light green, and then into a red-orange color as fall approaches. The leaves have a double-serrated margin and are wedge-shaped. A hornbeam leaf will sprout in the very late winter or very early spring.

How do American Hornbeams Reproduce?

Flowers

Flowers of an American hornbeam tree.

At the same time that leaves sprout, so will hornbeam flowers. American hornbeams are monoecious, meaning that they grow both male flowers and female flowers on the same branch.

The flowers emerge at catkins, which are usually pendulous, distinctive clusters with indistinct or no petals. A male catkin and female catkins look relatively similar. They are both clusters that are very light green in color. Though in order to achieve fertilization, the male flowers are pointed down, whereas the female flowers are pointed up.

Because both sexual characteristics are present on the tree, it is able to become fertilized through wind pollination. Wind will blow the pollen out of the male flower, which will then blow into the female flower, successfully reaching her ovule.

Fruit

Young leaves of hornbeam in spring.

The seeds of an American hornbeam tree don’t usually germinate until 2 years after they drop from the tree. Many of them end up getting eaten by small mammals and birds before they are able to develop into a seedling, but at least they will eventually be dropped in another area.

The fruit that comes from an American hornbeam tree is a light brown winged nutlet. They mature in October and develop in clusters of involucres. Involucres basically leafy winged bracts, which are specialized leaves usually involved in reproduction.

These bracts resemble an umbrella-shaped covering, which not only protects the fruit but also helps carry it to a farther location, which helps with increasing the spacial population of the tree.

Sexual Maturity

American hornbeam will usually reach sexual maturity and become fertile after about 15 years. It will reach its peak seed production time between 20 and 30 years, and will eventually stop producing seeds around the age of 75.

What are the Subspecies of American Hornbeam?

The American hornbeam can be divided into two subspecies, that are mostly characterized by their growing locations. There are not many differences between their physical appearances.

Carpunis Caroliniana subsp. caroliniana

The leaves on this subspecies are usually smaller and more broadly shaped. This variety will grow specifically from the lower Mississippi valley to eastern Texas, and from the Atlantic coastal plains to northern Delaware.

Carpunis Caroliniana subsp. Virginiana

The leaves on this subspecies are slightly larger than the other but tend to be more narrow in shape. This variety will grow specifically in the Appalachian mountains and westward to Minnesota, to southern Arkansas.

Where do American Hornbeam Trees Grow?

Replanting of young hornbeam trees.

The American hornbeam is a native tree to the eastern side of North America. Though it is called the “American” hornbeam, it does grow in certain regions in Canada as well. Specifically in Canada, it grows in southeastern Quebec and southeastern Ontario.

In the United States, it grows in many of the eastern states, including Minnesota, Florida, Texas, Arkansas, Mississippi, and Alabama.

In these regions, they will most commonly be found growing along ravine bottoms, and along the borders of swamps, streams, rivers, and lakes. This is because they are a water-loving species.

When they aren’t grown naturally, American hornbeams are planted in either home or woodland gardens, as a street tree or ornamental tree, but not usually as a shade tree because of their modest height.

What are the Growing Conditions of American Hornbeams?

Sunlight

American hornbeams are partial shade lovers, which is convenient since they really don’t grow to be all that tall, and would hardly be able to beat out many trees in the forest canopy competition. They can handle a maximum of 6 hours of sunlight per day. They should be planted where there isn’t full coverage.

Soil

American hornbeam trees absolutely need very moist soil. They like soil that is high in nutrients, is highly acidic, is very wet, but is also well-drained.

Water

These trees prefer to grow in regions where there is a very healthy amount of precipitation per year. To make up for the potential for lesser precipitation, they will usually be found growing alongside lakes, streams, swamps, and rivers.

Intolerances

This variety of hornbeam will not tolerate any sort of salt spray or soil salt. They won’t usually tolerate soils that are particularly alkaline, dry, or clay-like in texture.

How are American Hornbeam Trees Used?

Human Use

Because the American hornbeam is so small, its wood isn’t widely used in a commercial sense. Although, the wood is a very attractive light brown sapwood that is nearly white in color, and is hard, heavy, strong, and close-grained. For these reasons, hornbeam wood will sometimes be used to make certain kinds of tool handles, as well as walking sticks, walking canes, golf clubs, and longbows.

The American hornbeam is mostly known as being a very attractive landscape tree. It isn’t particularly messy, it has beautifully colored bark all year round, its leaves provide an ever change kaleidoscope of color, and it is a lovely shape as well.

Forest Ecology

Manicured hornbeam trees.

These trees are also an important source of food for several insect and animal species. The caterpillars of certain lepidopteran species (moths and butterflies) will eat much of the hornbeam foliage, specifically the lo moth (Automeris io).

The foliage, twigs, and seeds of the American hornbeam will also be heavily browsed by the ruffed grouse, the eastern tiger swallowtail, and other game birds. Deer will browse on the leaves and twigs of the tree.

FAQs

How long do American hornbeam trees live?

Under ideal conditions, the American hornbeam is able to exceed 300 years! This is quite impressive for such a little tree, and it places it in the old-growth community, which is a rather esteemed place to be!

How tall do American hornbeam trees grow?

American hornbeam trees are a very short species of tree, either being considered as a small tree or as a shrub. They rarely ever exceed 15 meters in height, and usually linger around 10 meters.

How fast do American hornbeam trees grow?

American hornbeams are slow-growing trees, which is well considering how short they are. They will never usually exceed growth of 12 inches per year.

Is hornbeam good for wildlife?

Hornbeam trees provide a tasty meal for various forest-dwelling creatures. Caterpillars and butterflies will eat their leaves, deer will eat leaves and twigs, and various bird species will eat hornbeam seeds.

Why do American hornbeam trees drop their leaves?

The American hornbeam is a deciduous tree, meaning that it will lose its leaves every fall. Trees do this to prepare for the cold winter months. Deciduous trees lose their leaves because they will fall dormant, and no longer photosynthesize in the winter — because this requires more energy than the winter sun can provide. Once spring approaches, new leaves will grow back, and the tree will wake up from dormancy.

What is the difference between a European hornbeam (carpinus betulus) tree and an American hornbeam tree?

There are truly not many differences between the European hornbeam and the American hornbeam tree. The main recognizable difference is found in their winter buds; the European hornbeam has a circular, short winter bud, whereas the American hornbeam will have a more ovular, long winter bud.

Should you prune American hornbeam?

When it comes to tree pruning, it isn’t a complete necessity (unless you’re talking to a landscaper). Trees do not need the help of humans to grow correctly, it is more for the aesthetic shape of the tree.

That being said, hornbeams are a popular choice for aesthetic shaping, so that can be done to the preference of the tree owner. Otherwise, trees should only be pruned if they have a branch that appears as being sick or dying, in order to preserve the rest of the health of the tree.

Can you prune hornbeam in the winter?

It would be considered unwise to prune any sort of tree in the winter, including hornbeam. This is because pruning in the winter will result in an open wound that seeps out the sap, creating quite a large mess.

If you are going to prune a tree, it is best to do it in the spring, when the tree has the energy to heal the open wound and to grow the rest of its limbs in a healthy manner.

How do you identify an American hornbeam tree?

The easiest way to identify an American hornbeam tree is by its bark. In young trees, the bark will be quite smooth, with stunning blueish-gray color. In older trees, the bark will be less vibrant and will have developed shallow fissures along its length.

Are hornbeam trees a hedge tree?

Hornbeam trees can be grown as hedge trees. For landscaping purposes, they are often planted close to one another to create a natural barrier. Once they develop their crowns, this will create a roughly shaped hedge.

What’s the difference between beech and hornbeam?

Beech and hornbeam look quite similar to one another, both in bark color and texture, leaf shape, and height. However, beech trees will have a more striking fall color than the hornbeam tree, and beech trees grow trunks that are more upright and straight, whereas hornbeams grow in a crooked and clustered manner.

Can you grow hornbeams in pots?

Because hornbeams are such small trees, it is possible to grow them in pots. However, it would be best to grow hornbeam from seed in a pot so that its root system can be properly established in that space constraint.

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