Late spring frosts can certainly affect the amount of flowering on weeping cherries, but if the tree is growing poorly otherwise, some other problem must be involved. Check the main trunk and area near the ground line for damage. Look for sunken bark, an oozing exudate, holes in the trunk, stripped bark, or anything else out of the ordinary. Your tree may have borers, have suffered sunscald injury, or there may be damage to the root system.
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