Common Buckthorn or Rhamnus cathartica
This is a thorny shrub or small tree that grows in the dunes
or on chalcky grounds. This deciduous tree flowers at the start
of the summer and produces green berries. These berries are poisionous
for peole . but are eaten by birds when they are black and ripe.
Common Buckthorn as a Hedge.
The Common Bucktohrn can be used as a good protection against buglers.
But Maythorn is a better choice,