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Old 04-25-2012, 09:56 AM
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Lilacs aren't fast growers.
That said... my Lilac by the garage is in a moderately shady spot & just cut down to 7 + feet from 10 feet to keep it not higher than my garage.

I love to cut them in the early spring to bring inside my home as part of decor.
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Old 04-25-2012, 10:16 AM
Location: zone 5
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Originally Posted by Hemlock140 View Post
Ours have reached at least 10'. If you want them tall they will get there eventually. My problem is the opposite, they got too tall and they only bloom on the previous year's growth so pruning them means no flowers for a year. They do also tend to send up new growth from the roots in our wet climate so they become bushy, not leggy.
They'll bloom the year after pruning, but as with most flowering shrubs you need to do it as soon as they're finished flowering.
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Old 04-26-2012, 07:54 AM
Location: Philaburbia
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My lilacs are four years old and already are over my head. I planted them five feet apart, and they've already grown together. They make a great screen.

If you want a denser hedge, you can stagger each shrub.
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