Maple is one of many deciduous varieties of trees, which means it goes through a period of dormancy and so many amateur gardeners in areas that have maples want to know exactly when and how to prune their trees. This is dependent on a few factors, so be sure to get all the pertinent information.
Often, people think that they have to prune a maple tree to prevent it from growing too tall, but this is inaccurate. In reality, pruning is necessary for all species of trees in order for it to be properly maintained so that it can retain its ideal health. With maple trees, pruning brings on "bleeding," which is due to the sap of the tree when it is not fully developed.
There are two appropriate times to prune a maple tree. The middle of winter is a good time because your tree will be fully dormant, and nothing will be disturbed. Perhaps the best time to prune a maple is when the leaves are fully-grown in, such as during the spring and summer.
Prior to pruning, you should determine which branch with which to start. Branches should be cut in a lateral position by the healthy areas of the tree. Cuts should be made at an angle beside new buds. This will promote new growth, which is essentially what you want.
Always prune away branches that appear on the verge of a break, and eliminate any dead and diseased branches to improve the look and condition of your tree. You should also prune a maple in steps rather than just at a single time, as a one-time pruning can cause the tree to go into shock. If there is any bleeding after a pruning, apply a good sealant over the area to contain it. However, rest assured that the bleeding doesn't harm your tree.