You all have seen the crepe myrtles that have a large tumor-like mass in the middle of the trunk. These masses come from incorrectly pruning the crepe myrtle by chopping the crepe myrtle off at the trunk instead of pruning the tree correctly.
Pruning a crepe myrtle is pretty simple, the object being......to prune the tree by thinning out the branches and trunks to allow for air circulation and future growth. To begin the pruning, start by removing the suckers at the base of the tree. Next, move to the canopy of the tree. You will want to step back take a good look at the tree and make a plan, don't just jump in and start cutting. Decide what are branches and what are the trunks of the tree. Crepe myrtles will grow multiple trunks so you need to decide which trunks you need to leave in order to maintain a good frame. If you need to remove any trunks you will want to cut the trunk at the base of the tree as close as you can get to the soil.