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May 20, Although you'll be losing some flowers for the current year, pruning overgrown lilacs is easiest early in the spring, before the branches leaf out. You can really see into the shrub and there is easier access to the base of the stems. Jun 19, Knowing when to trim older lilac bushes is important.

Most lilacs don’t require pruning until they reach about 6 to 8 feet tall.

The best time for pruning older lilac bushes is right after their flowering has ceased. This allows new shoots time to develop the next season of blooms. Pruning too late can kill young developing bushcutter.buzzted Reading Time: 3 mins. Jul 08, The time to prune mature lilac plants is just after the flowers have faded in the spring. Lilacs set next season's flower buds almost immediately, so late pruning will mean sacrificing the next year's flowers.

  Pruning early also gives new shoots more time and energy to develop, ensuring plenty of blooms for the following spring.

Doing so helps to maintain the plant's shape and to minimize the number of old, damaged branches, which are vulnerable to disease.

Oct 06, You should resist the temptation to prune or trim your lilac bush until it is at least 6 ft. tall, which typically occurs during the second or third year of growth. At this point, there will be enough excess stems and blooms for optimal shaping. And this is the perfect time of year to see them at their best and select the types that suit your own garden. About the Author. Wayne Mezitt is a 3 rd generation nurseryman, a Massachusetts Certified Horticulturist, now chairman of Weston Nurseries of Hopkinton, Chelmsford & Hingham MA, and owner of “Hort-Sense” a.

Jun 01, Read on for all the information you need about moving lilac shrubs. Moving Lilac Shrubs. Lilac bushes are lovely, fragrant additions to any home garden. They are also versatile shrubs, filling in as border plants, specimen ornamentals or as part of flowering hedges.

If you are thinking your lilac would look or grow better in another location.