Small bur oak tree
June 30, 2009 | 12:01 a.m. CDTA small bur oak tree lies in the Williamson's backyard, not far from its predecessor the big bur oak. Using a technique called grafting, a stem of the big bur oak was cut and planted onto the stump of another tree. The resulting tree is an exact genetic match of the 350-plus-year-old big bur oak.
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