If you don't have an existing hedgerow to work with you can always pile up branches between stakes/poles.
Our version is quite tidy (our meaning our environmental association on one of the community-owned biotops we are managing).
The corn field in the background is not part of our biotop anymore but of the neighbouring farmer. The
wood pile serves as a natural barrier to part of the outline of the area.
I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do. (E.E.Hale)