Because of their small size, dwarf apple trees are easy to prune. Usually there is no need for a ladder, making the pruning process easier and safer. Dwarf
apple trees need to be pruned when dormant. The best time is between January and March, before spring growth begins. For a young tree, decide the shape preferred. Pruning the young dwarf apple tree helps to shape a strong frame, needed to support the weight of the fruit. Mature trees need pruning to encourage new fruit.
Hand shearers and loppers should be sharp to prevent damage when cutting. Have a bucket nearby, containing approximately one cup of bleach in one gallon water. Dip your cutting tools in this mixture between cuts to avoid spreading any existing disease.
To prune young trees, decide the ultimate shape of the tree. — edubook.com