They don't get any water other than from the root and.

When lilac flowers reach their peak and are just this side of fading out, cutting them to create indoor bouquets actually helps the plant.

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

Apr 21, Mid to late spring is a good time to prune your lilac shrubs so they'll bloom for you later in the year. Mark Viette demonstrations"In the Garden".

Apr 02, 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. New shoots will develop during the regular growing season as long as there are a few healthy shoots left.

Once the growing season has ended, remove any unsightly shoots.