I've just planted a new yew hedge, consisting of 30 pot-grown plants
about 18" - 2' high. Should I cut back the plants now, or leave it
till next spring? And how much should I cut them back? They've got
about 2-3" of new growth on them, but I know Yew can be cut back to old
wood.

As I only want the developed hedge to be about 3' tall, I want to
ensure good growth right down to the base of each plant, which I guess
is going to be down to some effective pruning in the first few years.

Thanks

Neil