I have an in-ground Waterfall that I've neglected to prune properly and am coming to the task several years too late. It has been planted for ~8 years. My general practice is to never let weeping maples branch off into three directions at the same time. In this instance, three equal branches depart from the main trunk. I need to prune one of them because of the way the tree is growing onto my patio (see photo). This would result in multiple pruning "violations": a) would be pruning a branch the same diameter as the main trunk b) would be removing ~33% of the canopy in a single cut Should this wait until all the leaves are off and the plant is dormant, or could it be done now? Would you apply wound paste to such a large cut? Any other considerations?