Q: I have been fighting a losing battle with torpedo grass 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 any barrier.
A: Torpedo grass has shallow roots (rhizomes) that have a sharp, hard point, giving it the ability to penetrate most barriers. Look online for photos to make sure you identify it correctly. Apply glyphosate herbicide to the weed, using a foam paintbrush to avoid contact with your flowers. For larger areas, as in your lawn, spray once then do a follow up three weeks later. After that you can replant your lawn grass.