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Root depth in uncompacted soil
This root map shows a poplar tree excavated in USDA hardiness zone 6 in uncompacted (1.4 g/cc) sandy loam soil. The root system in an uncompacted soil largely develops throughout the top 2 to 3 feet of soil. Lateral roots grew fairly straight and ranged from 1 to 18 inches deep.
This poplar tree found three uncompacted soil pockets (see three arrows) and produced roots down to about 32 inches in those pockets. These deep roots branched more and followed cracks and crevices. Deep roots often are found close to the trunk.
