Hazel wrote:

I have seen a hazel wood, the hazels are growing as tree's rather than
shrubs. How are they made this way as they are normally shrubs ?

Hazels are trees and can grow to around 10 metres
(http://www.treesforlife.org.uk/tfl.hazel.html). The ones you see as
bushes are like that as they are usually coppiced.

Brian

I will quote from the link you gave "Typically it has a number of shoots
or trunks branching out at, or just above, ground level, and this growth
habit has led to some people referring to it as a bush rather than a tree,
because it doesn't meet the strict definition for a tree, of having a single
stem that is unbranched near the ground."

I know they grow like that ^^, My three tree guides all give them as
multistemmed plants.The distinction between shrub and tree has nothing to do
with the size plants attain

To grow them, with a single trunk I assume all the side shoots have to be
removed, is this needed for the life of the plant ?

Hazel