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Dip, spray or wipe the blades of the pruning shears or loppers using rubbing alcohol.

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.

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This allows new shoots plenty of time to develop the next season of blooms. Pruning lilacs too late can kill young developing buds.

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. Late spring: Cut the tallest canes to the ground. Thin out excess suckers. Shorten any remaining cane to allow it room to grow un-cut the rest of the summer.

Below, left: In year three the dwarf lilac blooms well and is the right size for this bed. Below, right: A few weeks after it blooms, we cut out the tallest canes and thin the rest.

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 with ten blooms on shrubdrop.buzzted Reading Time: 4 mins. 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?

5. Prune three of the oldest stems at ground level, beginning in the lilac’s third growing season. Removing old growth renews the lilac and provides aeration for the center of the plant. If the. Jul 08, 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.

The time to prune mature lilac plants is just after the flowers have faded in the spring.