European Hornbeam

Arbor walk #74, Treekeeper ID #2259

This adaptive species is often grown as a shield or hedge plant in urban settings, as it grows a thick canopy that extends most of the way to the ground. 

The leaves often have distinct ridging and turn bright yellow/orange in fall. The nut-like fruits mature in a similar fashion to beads on a string in October. The Hornbeam, also known as ironwood due to its very strong wood which rarely cracks, is often used to build mallets, wheel cogs, wooden screws and pianos. These trees do extremely well in acidic soils.

NameEuropean Hornbeam
Latin NameCarpinus betulus
Indigenous Name(s)
Cultivar/Variety
Commercial Name
Global Distribution
Where to find Arbor Walk #74 on WashU campus
Our European Hornbeam in space
GPS Coordinates

N/A

Percent Concrete

N/A

Distance to Buildings
YearClose Building #1Close Building #2Close Building #3
2020Park House, 45.23 mWheeler House, 32.99 mShepley House, 46.77 m
Distance to Other Species
YearClose Species #1Close Species # 2Close Species # 3
2020River Birch, 6.10 mEuropean Hornbeam, 4.62 mEuropean Hornbeam, 5.43 m
Our European Hornbeam through time
Standard Measurements
YearHeight (m)DBH (cm)Caliper (m)Crown Diameter N-S (m)Crown Diameter E-W (m)Average Crown Diameter (m)
20207.22869.2N/A2.422.452.435
20237.4610.5N/A3.358.76.025
Nests and Pests
YearDescription
2020Crown becomes dramatically bare as it goes higher up
1 spider egg sac
Some light grey and green lichen and darker green algae
How to identify a European Hornbeam
Leaf Identification

The European Hornbeam has asymmetrical ovate-shaped leaves with serrated margins that are up to 5″ long. They are a dark green and turn a bright yellow/orange color in the fall.

Twig and Bud Identification

The twig is greenish brown with numerous white lenticels (pores) and spread-out long white hairs along the twig reaching the bud. The bud has multiple brown scales, sparse hairs, and is elongated at its tip.

Bark Identification

The European Hornbeam has gray bark with muscle-like fluting.

Fruit Identification

The European Hornbeam has drooping nutlet clusters in 3-lobed bracts that are around 5″ long. They ripen in summer.

[photo forthcoming]

Flower Identification

The European Hornbeam are monoecious. The male flowers have yellow, 1 1/2″ catkins, and the female flowers have greenish, 3″ long catkins. These flowers appear in early spring.

[photo forthcoming]

Relationship of Carpinus betulus to other species in the arboretum
Additional resources on the European Hornbeam

Take a look around Arbor Walk Tree #74