Answer: Pyrus calleryana 'Bradford' is an ornamental pear growing 50' tall and 30' wide at maturity. In general, roots will extend one and one-half times the diameter of the canopy. The largest roots (those most likely to lift a sidewalk) will be concentrated under the canopy, extending out from the trunk. The smaller feeder roots can venture out past the canopy, but they shouldn't cause a problem with curbs and sidewalks. To be on the safe side, plant your tree 25'-30' away from driveways and sidewalks.
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