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Completely topping a plum tree is a risky business. Cut too much, and you’ll kill your tree. That said, you do need to trim the top of your tree to encourage bushy growth, maintain your tree’s vase shape, and limit size. 

A plum tree's central leader (or trunk) should never extend more than 3 feet above the highest branch. When you first plant your tree, cut the central leader so it’s 2 to 3 feet tall. As it grows, cut it back 12 to 20 inches until it reaches its desired height. Never prune more than one-third of the new growth.

No. Topping a tree refers to severely cutting down all its major branches and tree in a straight line. It was once recommended for streetside deciduous trees but has fallen out of practice. Topping leads to many problems, removing so much of the tree that many trees struggle to survive and become much more vulnerable to insects and diseases. Also, it doesn’t really help tree growth as once assumed and often leads to an ugly appearance of many sprouting stems in competition to become new main branches.

Some trees will bounce back just fine, and others will struggle and possibly die. Evergreens, for instance, have a very difficult time recovering after droughts and usually die after periods of extreme dryness. Usually, you’ll have to just wait and see—if the drought occurs in wintertime, it’s possible that your tree will recover during the gentler springtime.

You can use the formula mentioned earlier to calculate the depth of tree roots. Each inch of width of a tree trunk translates to six inches of depth within the root system. Large trees extend anywhere from 2 to 6 feet into the ground, with some magnificent specimens going even deeper.