Depending on soil and other growing conditions that plant will grow at a moderate rate reaching 20 to 25 feet high and 10 to 15 feet wide in about 8 years. You can prune it back to keep the width more narrow but if you do so just cut about 2 or 3 inches off the tips of the side shoots so you encourage more branching and don't leave that area bare and unattractive.
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