Answer: In my experience, cherries are best left unpruned with the exception of removing already dead or diseased wood. The reason for this is that they are so often subject to disease and insect problems -- and every cut allows an opportunity for entry. If it is a weeping tree and beginning to reach the ground, the better approach is to allow it to weep and then cover the ground beneath it with mulch and/or groundcover. This allows the tree to shade its roots naturally and helps keep the soil evenly moist, which is healty for the tree. If you have a tree that seems to be dieing back and needs substantial work, I would strongly suggest you consult on site with a professionally trained and certified arborist with experience in ornamental trees and see what the prognosis is. In general, they are not terribly long lived.
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