Carpinus betulus Seeds | European Hornbeam

Pleated green leaves and hanging three-lobed bracts on a European hornbeam branch — European Hornbeam (*Carpinus betulus*): Betulaceae, oak and beech woods across Europe and western Asia.

LATIN NAME: Carpinus betulus

COMMON NAME: European Hornbeam

Plant Profile

European hornbeam is the hedge plant of the great formal gardens, and it earns that role through a single quality: it takes clipping better than almost any other deciduous tree. Left alone it becomes a small to medium tree, fifteen to twenty metres, with a fluted, muscle-like trunk and a dense, rounded crown of pleated leaves. The leaves are ovate, sharply ribbed and finely toothed, mid-green and turning a clean yellow in autumn before they fall. The wood is the hardest of any European tree of its size, pale, close-grained and almost impossible to split, which is why it was used for cart cogs, mallets, butchers’ blocks and piano actions before metal and plastic took over. The catkins appear with the leaves, and the fruit is a small nutlet in a three-lobed green bract that hangs in clusters through autumn. It is a tree of oak and beech woods across Europe.

Science & Biotechnology

Carpinus betulus is a diploid with 2n = 32, and it is wind-pollinated, flowering in spring before the canopy closes. Its wood is the densest in the European flora, with a specific gravity around 0.8 when dry, and the reason is the very small vessel diameter and the thick fibre walls, an anatomy that also makes it slow to dry and prone to checking if dried too fast. The species is tolerant of heavy clay and of periodic waterlogging, and it coppices vigorously, which is why it persisted as a managed woodland tree across Europe. Seed has a double dormancy: an immature embryo that needs warmth to develop and a coat that needs cold to break, so natural germination takes two springs. Hornbeam is also one of the trees most tolerant of hard, repeated cutting, producing dense, twiggy regrowth from old wood.

Uses & Benefits

Hedging and pleaching are its first use, and in that role it is close to ideal: dense, long-lived, tolerant of shade and of being cut back to old wood, and it holds dead leaves through winter when clipped as a hedge. The wood is the second use, and a remarkable one: hard, pale and uniform, it went into piano hammers, tool handles, skittles, chopping blocks, cart wheels and the wooden screws of presses. It makes excellent firewood and charcoal. In gardens it is also grown as a specimen tree for the fluted trunk and the autumn colour, and as a subject for bonsai, where the small leaves and the willingness to back-bud are assets. There is no significant medicinal use. The name hornbeam refers to the horn-like hardness of the wood, not to the hop-like fruit.

Growing from Seed

Sow in autumn and leave the pots outdoors for two winters, or give three months of warm followed by three months of cold to break the double dormancy. Germination is slow and uneven, and a proportion of the seed will come in the second spring. Use a humus-rich, well-drained mix, cover the seed lightly, and keep it moist in light shade. Pot on when the seedlings are ten centimetres, and line out for a year before planting into a hedge. For a hedge, plant thirty to forty-five centimetres apart in autumn or early spring, cut back hard after the first season to encourage branching from the base, and clip twice a year thereafter. It tolerates sun and shade, clay and chalk, but not waterlogged ground.

Our Take

The best deciduous hedge tree in Europe, with wood that made piano actions before steel did. Plant bare-root in autumn and clip it hard from the first year.

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