28+ Lilac Bush Doesn't Bloom
PNG. When to prune lilac bushes. Since lilac borers are attracted to older, woody stems, pruning will prevent problems from this insect pest.
Planting Lilacs Lilac Bushes Gardener S Supply from www.gardeners.com
Lilacs bloom on old wood, so try to prune only lightly right after the blooms fade (or when they would have faded if you'd had any). The wind sway the branches with beautiful flowers. Usually, the only pruning they need comes from picking the flowers (with an eye to the shape of the shrub), but if you feel you must prune, do so just after the flowering season and take out.
If you save the task for later in the season, you risk pruning off next year's.
Doesn't get ugly from fungus and bacteria like older. I love the fragrance and was so happy to see the bushes in bloom. Lilacs need lots of sun, and if no flowers appear, they may need more light. Lilacs bloom on old wood, so try to prune only lightly right after the blooms fade (or when they would have faded if you'd had any).