Leylandii will do this very well as long as you take out the top to stop it
growing beyond the desired height, but is something of a thug and thus not
generally popular with neighbours.
Eucalyptus is a fast grower and much prettier.

"R" wrote in message
om...
Hi

I am looking for a tree/shrub that is a fast grower- to give more
privacy from houses overlooking at back of the garden. Want something
that can grow to about 20-30 feet and be fairly wide.
Live in the South, very clay soil and back of garden is fairly shady.

thanks
R.