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Thick lilac stems can be very tough.

Apr 02, Most lilacs don’t require pruning until they reach about 6 to 8 feet ( m.) tall. The best time for pruning lilac bushes is right after their flowering has ceased. This allows new shoots plenty of time to develop the next season of blooms. Pruning lilacs too late can kill young developing buds. If you are pruning lilac trees or shrubs entirely to within inches of the ground, it is best to do so in early spring. Jul 14, Why should lilacs be pruned in early summer?

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Lilacs grow the next season’s flower buds in early summer, immediately after their flowers fade. If you put off pruning until later in the season, you risk removing the developing buds. This is equally true for lilacs such as Bloomerang Purple that bloom twice a year. By pruning the bush after its initial bloom, you encourage new growth and Estimated Reading Time: 2 mins.

Jul 08, There are two approaches you can take. The less drastic approach to getting an overgrown lilac back into shape is to use the third rule. Prune a third of the oldest branches all the way to the ground each year for three consecutive years. 1  Start by taking out the thickest stems first. Cut off all of the lilac bush's branches that are broken or show obvious signs of disease.

They are more likely to cause problems than to produce a lot of flowers. May 19, Lilacs flower on"old wood"- that is, they form their flower (and leaf) buds during the summer. These open the following spring.

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If you prune any time from when the buds have developed to when they would open, you remove them. Therefore pruning should take place immediately after the flowers fade, when the new buds haven't yet formed.