"Hainbuche" often grows as a hedge. In former times there was often a hegde to protect the streets (Wehrhecke, Landwehr). The hedge was 10 - 20 yards wide (up to over 100yards wide) and complete grow close with blackthorn, hornbeam and other brushwood. The plants are so close, that a cavalaryman (horseman) don't can pass.
But there are also "Hainbuchen" in the forest. They grow like you see on the pic