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Oregon State University Extension.

Apr 02, How to Prune Lilac Bushes.

But, if they are old, overgrown shrubs and bushes, you need to cut all the unnecessary shoots.

When pruning lilacs, cutting back the tops of overgrown stems is oftentimes not enough. It is generally better to cut the entire stem. Trimming lilacs is best accomplished using clippers. Remove spent blooms all the way to the stems to prevent seeding and encourage more blooms later on. Cut back about a third of the branches. Jul 08, When to Prune Lilac Bushes. Many of the newer lilac varieties grow quickly and might need pruning starting in their second or third year.

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. Jun 19, When pruning lilacs, it is generally better to cut the entire stem. This is best accomplished using clippers. This will keep a younger bush looking nice, but older ones need more intense pruning.

Knowing when to trim older lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet shrubdisposal.buzzted Reading Time: 3 mins. Oct 06, While a little care is required to keep plants healthy and strong, getting too happy with the pruning shears early in the life of flowers like the lilac results in stunted or dead plants.

You should resist the temptation to prune or trim your lilac bush until it is at least 6 ft. tall, which typically occurs during the second or third year of shrubdisposal.buzzted Reading Time: 6 mins.

Nov 17, The lilac bushes are overgrown, and it is hard to get under them to get the plastic and the bark out. I was wondering if it is okay to prune them in the fall and, if so, how much is too much to prune back? This is the first time that I have had a yard, so I don't know a whole lot. Sandra Lake.

Dear Sandra, The best time -- and only correct time.