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A lilac bush does best when it is trimmed every year.

Jul 08, Most flowering shrubs need regular pruning to keep them vibrant, and the common lilac (Syringa vulgaris) is no exception. Lilac bushes will typically flower without any effort from you.

Mine are the old fashioned kind and the leaves are almost heart-shaped.

However, if left to grow and spread on their own, common lilacs will eventually only flower on the tops of the uppermost branches. Jun 19, Knowing when to trim older lilac bushes is important. Most lilacs don’t require pruning until they reach about 6 to 8 feet tall. 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 bushclear.buzzted Reading Time: 3 mins.

Oct 06, Pruning Lilacs: When to Trim a Lilac Bush A common problem with amateur and experienced gardeners alike is the tendency to go heavy-handed with maintenance. 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 bushclear.buzzted Reading Time: 6 mins.

Method. 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. Lilacs bloom on newer growth, so the blooms will be on the new younger branches growing out from older trunks. Therefore as the bush gets older and older and puts out more and more new branches, since it blooms better on those newer branches, gradually the blooms are all way up high and unreachable to gather for bouquets.

Jun 10, Use clippers to trim the plant close to the ground. If the trunks are very thick, you may need a saw. Cut each branch back by 1/3 to 1/2.

The lilac will grow back, but it'll take a season or two. If you discovered that your plant was grafted, be sure not to cut below the bushclear.buzz: K. Dwarf lilacs rarely need pruning ‘Palibin’ Meyer lilac (Syringa meyeri ‘Palibin’) and ‘Miss Kim’ Manchurian lilac (Syringa pubescens ssp. patula ‘Miss Kim’) are both relatively small lilacs with a twiggy bushclear.buzz pruning other than deadheading is required on these types.

As the plants age, you can remove a few of the oldest stems to make room for younger, more vigorous stems.

My Lilacs Are too Tall & Leggy. Lilacs (Syringa spp.) have long had a place in American gardens. The vigorous, deciduous shrubs are grown for their fragrant spring flowers, but also feature green.