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But sometimes the older lilac get so overgrown and aged, they seem to stop blooming.

Dec 10, Cut spent flower heads off after the lilac has finished blooming, when one or two new shoots become visible under the flower cluster. Make. 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.

Prune lightly, cut back flowered shoots to strong buds on lower growth.

Pruning lilacs too late can kill young developing buds. One cut per year leaves it ready to grow back to the same acceptable size and bloom well. (See more photos of this routine applied to this shrub and also to common lilac in A Lilac's Annual Cut.) Below: What you see here may be the perfect size for a dwarf lilac.

Jul 08, If you can't stand the look of your old lilac or you just want a quicker approach, you can take the drastic measure of cutting back the entire plant to about 6 to 8 inches above the ground in the early spring.

This is done in early spring by removing two or three of the plants largest canes to the ground. Repeat this process each year over a three year period to re-invigorate old plants. Please be aware, however, that renewal pruning will reduce the number of blooms for that year.

Jul 26, Lilacs are not toxic. But you would want to discourage critters from eating lilac wood because it will cut back the flowers. Can you prune a dwarf lilac bush in October? My experience with cutting lilac way back is, they grow year 1, bloom year 2. Don’t be discouraged if you don’t have blooms the first year.