Answer: Grafted sweet cherry trees are often grafted onto dwarfing rootstock but unless they are pruned carefully, the grafted varieties can either be pruned off completely, or, if they are not pruned, can overtake the rest of the tree. Try to identify the individual grafts by inspecting the trunk. You may very well find that the original tree died back during a hard winter freeze and your current tree is simply a vigorous shoot that has overtaken the entire tree. If this is the case, you may want to remove and replace the tree with a new one.
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