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Pruning a Lilac Bush

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Bronze Feedback Medal for All Time! 121 Feedbacks
April 7, 2017

How and when should I prune my old fashioned lilac? It is maybe 10 years old or more. I don't think it has ever been pruned.

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It blooms on the south side of the bush. This year the blooms are very small.

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Silver Post Medal for All Time! 255 Posts
April 7, 20171 found this helpful
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In my master gardener class we discussed this. Here are my notes.

Only need to prune for a desired shape, and it must be done as soon as the blooms are finished. By summer, they are already forming the buds and growth for the next year. Pruning is not necessary. Lilacs do best and bloom best in full sun. Too much shade and they won't bloom. Trim out any dead portions of the lilac. Be sure it has good air flow.

The very best time to prune is mid December to early spring BUT if you do it then you won't get any blooms the following year.

Too much nitrogen, and they won't bloom good.

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2 More Questions

Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

June 19, 2009

When and how do you prune a lilac bush?

Hardiness Zone: 4a

By b ludwig from WI

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Silver Feedback Medal for All Time! 290 Feedbacks
June 20, 20090 found this helpful

One of the widows on our street where we used to live, asked my husband if he would prune her lilac bush.

In the autumn when the growing season ended he just sawed off a lot of the limbs.

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June 27, 20090 found this helpful

I have to agree with trimming off the spent flowers because the new growth supplies the blooms for the next year. However, I went nuts on my lilac bushes that divide my back yard from my field a couple years ago because they were so overgrown and thick they barely flowered.

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This year I had the most blooms in 5 years!

 
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June 19, 2009

My lilac bushes do not have too many flowers this year. When is the proper time to prune?

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