Controlling Torpedograss

Q: I have been fighting a losing battle with torpedograss in my lawn and flower bed. I put down cloth barrier, plastic barrier, and old carpet. However the roots of the grass are so aggressive, they go straight through the barrier.

A: Torpedograss has shallow roots (rhizomes) that have a sharp, hard point, giving it the ability to penetrate most barriers. There are no selective herbicides that will control it. Instead, apply glyphosate herbicide to the weed, using a foam paintbrush to avoid contact with your flowers.

For larger areas, as in your lawn, spray with glyphosate then do a follow-up spray three weeks later. Both your lawn grass and the torpedograss will be killed. After that you can replant your lawn grass.