with a few exceptions, tree roots in the landscape rarley go deeper than 24
inches. In the forest they may go much deeper but not in your yard, unless it
is an old farm field. In any case, willow roots are never, ever going to reach
a depth of 6-7 feet.
I think the only exception to that rule is if it follows a pipe or drain
system down to where there is more water. For example, a catch basin with
an underground pipe running to the storm drain/dry well. The roots don't
have to penetrate the pipe, they'll happily follow the outside.
Rapid Realm Technology, Inc.
Hopkinton, MA (Zone 6a)
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