Most underground roots remain in place
A grinder works on the stump and selected accessible roots near the surface. The wider underground root system remains in the soil and gradually breaks down. That is one reason grinding is less disruptive than excavating an entire root mass.
Surface roots can be a separate scope
If large roots still create a mowing hazard or block a landscape project, point them out before the quote. Some equipment can grind accessible roots, but the work area becomes larger and underground utilities or nearby live trees can change what is appropriate.
The ground can change as wood decomposes
As buried organic material decays and disturbed soil settles, the area may develop minor depressions. This is especially relevant when restoring turf or placing a finished landscape surface over the former stump location.
Do not grind roots of a living tree casually
Roots are part of the structural and biological system of a living tree. If the roots belong to a tree you intend to keep, consult a qualified arborist before cutting or grinding them.
Frequently Asked Questions
Do roots disappear immediately after stump grinding?
No. Most underground roots remain and decompose gradually.
Can surface roots be ground too?
Accessible surface roots can sometimes be included, but they should be identified during the quote and checked for utility or live-tree concerns.
Can I build directly over an old root system?
That is a construction question that depends on the project and site. Tell the appropriate contractor or engineer about the previous tree and stump location.