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pickindaisies

Lilac looking bad - how much to prune back?

pickindaisies
10 years ago

I have a few beautiful lilac bushes. Two are doing great - one of these two I pruned back quite a bit last year because of some non-blooming branches. A third bush, just a few yards away from this one, is hardly flowering or even growing any leaves at all. Not sure why since the other two are doing fine. Should I prune this back quite a bit too or should I try to find out why else it might be lacking new growth?