While the plants are young, deadheading the spent flowers helps.

Apr 02, 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 when can you cut flowers from lilac bush 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 22, Lilacs flower in mid-spring, but the flower buds are produced in late spring or early summer soon after the old blooms die.

You must deadhead the lilacs soon after they finish blooming so. Cutting your lilac blooms now are fine. The new blooms start coming later, so you will not effect next year's growth. Never trim a lilac early spring, always wait until after it has bloomed. Jul 08, 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.

After three consecutive years of pruning your overgrown lilac in this way, new shoots should comprise the bulk of the plant.