"Marley1372" wrote in message
...
In any case, willow roots are never, ever going to reach a depth of 6-7
feet.
Toad

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.

-al sung
Rapid Realm Technology, Inc.
Hopkinton, MA (Zone 6a)