If you mean the Pieris japonica or lily of the valley bush this evergreen shrub is easy to prune to shape. Early spring is a good time to prune back the tallest branches removing no more than one third of the shrub. Follow a branch all the way down to a joint or node and remember that the spot you make the cut will be the spot that will sprout new growth. It may take a few years of snipping back the top of the shrub but you will train it into a more compact shape. Keep growing, Marianne Binetti