To eliminate bindweed get a large piece, at least 2’x2’, of flat….

Cardboard. Locate center. Use razor knife to slice a straight cut from center to one of sides. Pull problem bindweed though slit. Spread it out on cardboard leaving cardboard nearly flat, protecting your treasured perennials below by snuggly closing slit. Spray with herbicide and allow to dry. Repeat process for each bindweed. No wind and at least 70° works best.