Question
I planted three hemlocks years ago to form a sight block from
our driveway to our back yard. My intent was to let them grow
and then trim them into a hemlock hedge.
Needless to say I never trimmed them and now they are about
20 feet tall. Can I still cut these back and shape them into
a hedge? Or, am I better off starting over? If yes, how and
when is the best time to do this?
Answer
About the hemlocks, you could top them now and prune the branch
tips just as buds are swelling. Be aware that wooly adelgid
is a deadly pest on hemlock and pretty sure to show up, so
twice a year spraying is essential for keeping a hedge of
hemlock around here (Connecticut). Think about that before
you decide to keep or ditch the hedge.
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