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Wait until it’s done flowering so you get to enjoy it first. Then knock it back whichever way you see fit. You’ll struggle to kill it by pollarding so just prune it into whatever shape will be most convenient in future. If you’ve got existing pruning points to work to then even better.
Lovely colour on that one.
edmundro
Bobbo
We've got this lovely old lilac tree in our front garden we moved in about 18 months ago and there was only the old growth on it so it's had 2 flowerings as is, do I need to pollard (I think that's the correct term - cut off the new growth) it anytime soon?