In the UK, hornbeam trees have a fairly slow rate of growth, reaching 6 meters tall and 4 meters wide in 10 years. The trees reach 11 meters tall and 6 meters wide in 20 years, and finally 25 meters tall and 20 meters wide when mature. Young hornbeams have the shape of a pyramid, getting rounded as they age. They can grow in partial shade or full sunlight and can survive in any climatic condition or soil.