When is it the best time to trim a lilac bush.?

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Planting zone 6. Huge lilac bush - beem there over 35 years.

  10 answers
  • Cindy Carmichael Cindy Carmichael on Apr 06, 2018
    You can trim it right after it is done blooming. Don't wait too long. Don't trim any more that a third of the plant.

  • Peter Peter on Apr 06, 2018
    AFTER it has bloomed. You'll have an idea of which part is too big, or dense, or flowerless... so wait a bit.
    ALSO---DO NOT remove more than 1/3 of any shrub you want to keep... it may not recover.
  • Janet Pizaro Janet Pizaro on Apr 06, 2018
    immediately after flowering has finished
  • Claire Claire on Apr 06, 2018
    After it blooms and BEFORE the 4th of July. Pruning like this will bring more blooms every year. Don't prune more than 1/3 of the total bush per year.
  • Holly Kinchlea-Brown Holly Kinchlea-Brown on Apr 06, 2018
    Trim it back (no more than 1/3 of the bush in any given year) after it has finished blooming.
  • Inetia Inetia on Apr 06, 2018
    Right after it's done blooming.
  • Linda Linda on Apr 06, 2018
    Thank you all for the answers!
  • Emily Emily on Apr 06, 2018
    Linda, one more. If they are too tall or awkward or out of shape, cut down to the ground and let the new growth replace it. Keep those in shape. Lilacs are very hardy. We cut all ours down once and have them back again. If they get too tall you can't cut the flowers.
  • After it completed it's blooming cycle
  • Michelle Leslie Michelle Leslie on Dec 17, 2020

    Hi Linda, here's a great article and video that will show you how and when to prune your lilac bush  https://www.thespruce.com/pruning-lilacs-how-and-when-to-prune-lilacs-1403004

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