Answer: If your tree is producing flowers and new leaves, it's probably healthy. I wouldn't dig it up and replant it - doing so will retard growth as the roots become re-established. Slow growth can usually be improved with the application of fertilizer. Use a general purpose 10-10-10 (a time-release encapsulated type) fertilizer and apply in amounts as indicated on the fertilizer package. You should see some improvement later this summer.
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