The most effective method I've seen uses clear plastic. Soak the area first, then put the clear plastic over it. Heat is actually generated in the soil and is held by the plastic. The moisture allows better conduction of the heat into the soil so it kills the roots more effectively. Even at that, the recommendations I've seen suggest that you should leave the plastic in place for at least six weeks before using the area.
-Lon Rombough
Archive powered by MHonArc 2.6.24.