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My lilacs are the really old-fashioned kind gifts from friends and relatives that.

As soon as the lilac bush's flowers are dead, trim each flower stem back to the leaves, removing all trace of the flowers. This step stops the lilac from using its energy to make seeds. 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. Jun 19, 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 buds. Deadheading, should be done as soon as possible after the flowers fade. The old flower cluster should be cut off at its base- just above the two new shoots that Estimated Reading Time: 3 mins.

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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. Jun 10, This type of pruning goes beyond a lighter annual pruning to severely cut the bush or tree back, allowing for new growth to occur. Do your assessment in early spring, before the lilac has come back to life. This is the best time of year for a deeper treemulching.buzz: K. Dec 10, Whenever possible, avoid pruning the lilac in summer, fall or winter, because the lilac blooms on growth produced during the previous growing season.

Delaying pruning for more than a few weeks.

So I have just done a complete rejuvenation on my Old Lilac and I am excited to see what will happen next spring when it is all full of young and new branches.

May 19, Try pruning the outside branches to desired height after blooming. Leave the inside branches for next year. If the outside branches looks good next year, then trim back the inside branches next year after blooming.