The best time to prune Denver lilacs is just after the spring flowers have faded.

This is because lilacs set the next year’s flower buds immediately after the flowers have died. Late lilac trimming (or early, depending on how you look at it) will kill off these buds, thus the plant won’t produce flowers the next season.

Lilacs are hardy plants that can grow up to 20 feet high and have large, uniquely fragrant spring flowers, making the lilac bush a favorite among homeowners and plant care enthusiasts.

Lilacs are tenacious plants that will create many suckers that can quickly take over a yard, killing other plants as they go.  This is why your lilac needs yearly pruning!  Pruning a lilac isn’t difficult, but it’s vital to follow certain lilac pruning guidelines, or your plant will suffer – and you won’t be able to enjoy the springtime flowers the plant is known for.

Different varieties of lilac listed here.

Denver lilacs

In the picture above, pruning the lower half late in the year killed the following year’s flower buds, while pruning the upper half at the proper time allowed the plant to flower.

Another pruning rule is to never cut more than one third of a shrub’s stem, and always leave a little green on top.  This will allow new stems to develop and old stems to peak and bloom.

Be wary of the company you choose for bush trimming services.

Most companies simply run a trimmer along the side of the bush without any knowledge of the bush in question.  By doing this they could be doing more harm than good killing off the next seasons flowers, damaging the plant, and leaving an unhealthy-looking, ugly plant in your yard.

In contrast, having a quality company such as Arborscape do the work assures that the flowers will bloom as desired during the following season, the bush will be trimmed down to a healthy size, all deadwood will be cut out, and you’ll be left with a beautiful and healthy plant. Check out ArborScape’s page on shrub trimming.


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