Answer: Japanese Maples are slow growing trees with a maximum height of 20' at maturity. You can expect normal growth of 5"-6" inches per year. Many Japanese Maples are used as container plants, and they are a favorite bonsai subject because they are so slow growing. There isn't much you can do to make the tree grow faster, and if you overfertilize, the resulting rapid growth will be spindly and weak.
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