On Feb 14, 11:34*pm, Lawn Guy wrote:
wrote:
Some trees tend to have roots that run close to the surface and
they are a big problem when trying to grow grass.

Large roots are not mobile. *If you cover them with dirt, they're not
likely to move up on their own and come back to the surface. *This is
especially true in clay soil.

They don't have to be large roots. Some trees have thin roots that
still form a dense mass and will indeed grow up into new soil. Norway
Maples are one species well know for this problem. If the roots
didn't want to be closer to the surface, they wouldn't have grown up
there to begin with.