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Apr 02, When to Trim Lilac Bushes. Knowing when to trim lilac bushes is important. 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. Jul 08, Many of the newer lilac varieties grow quickly and might need pruning starting in their second or third year. In general, by the time a stem reaches more than 2 inches in diameter, it should be pruned. If you are diligent with annual pruning of your lilac, the shrub will grow to about 8 feet tall with flowers throughout the branches.

Jun 26, Timing is the Decisive Factor in Pruning Lilacs If you want to have your blooms next year, it is crucial to prune in those first few weeks after blooming ends. Ideally, this is when you would do maintenance pruning each year.

But I get so lazy busy, I end up with a ten foot bush Estimated Reading Time: 4 mins. Aug 21, If you want to prune your lilac to reshape it or to reduce its height, you could do it now, but it would be better to wait until spring. You see, if you prune in August, the lilac may produce new shoots that won’t have the time to harden off properly (prepare for winter) and they could be damaged by winter cold, obliging you to prune again in the shrubhauling.barted Reading Time: 2 mins. Nov 27, Generally, lilacs do not need to be cut back until the plant reaches eight to ten feet tall.

However, the best time to prune the entire bush down to the ground is at the beginning of spring. Lilacs should be cut back annually. How to Prune Lilacs. To prune a lilac bush, begin by removing larger stems from the center of the plant with a pair of sharp gardening shears or clippers. Always cut at the base. Lilac bushes are some of the plants which need this for proper, orderly growth.

You can start pruning them when they are years old, and have established themselves well. In their case, it is important not only to prune, but also to do so at the right time of the year.

Here are certain tips that may guide you on how to prune lilac shrubhauling.barted Reading Time: 4 mins.