Cherry pits should be planted in the late Fall because they need the cold weather of Winter to germinate in the Spring; this is called "stratification". I would plant several pits (but not in the same hole) to make sure you get at least one or two to sprout and when they are around 18 inches high, transplant them to their permanent location.
Try planting some cherry pits in a small flower vase and see if they sprout. If nothing grows, you would be better off purchasing a small cherry tree from a nursery.
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