will a hedge stand as adverse posession and count as fencing in?

Answer 1

Not usually just as long as the hedge isnt huge

Answer 2

It can be construed as such. By placing a hedge around the property that you are openly using as if it were your own, then 21 years later, if the correct owner has not done anything about your open infringement on his property, you could have a decent case for adverse possession.
But why would anyone intentionally create needless hostilities with their neighbors?