To prune or not to prune…How do I ensure my lilac tree keeps blooming?
Prune away. Lilac bushes should be pruned and maintained each year for a well shaped and healthy plant. The plants should be full looking, yet not overly bushy. If the plant is too bushy, the inner leaves do not get sun and air circulation, an invitation to plant disease. Trim larger stems from the center of the bush to increase ventilation. It will also afford more room for newer shoots on the outside of the plant to develop. Pruning should be done immediately after the flowers have died off. Cut small suckers and shoots at or near ground level, or where it comes out of the main trunk. Leave a few strong and healthy new stalks each year, especially if you are planning to trim back old wood. Trim back any branches that stick out from the main bush.
