You can prune back your Azaleas up to early July without loss of future blooms. We suggest July 4th for a convenient date to remember to serve as the last day for pruning Azaleas. Remove strong growing erratic shoots several inches below the outer level of the shrub so that the new growth will not quickly out grow the limits that you would like to set. We suggest using lopping shears with a by-pass cutting action to provide sharp clean cuts.