The University of Idaho Cooperative Extension suggests burying 14-inch-wide strips of aluminum or galvanized steel flashing (used in roofing) around the outside of the garden beds. In addition, be sure to remove any suckers that pop up outside the growing area. Some people have success if they rototill and/or mow the area around the growing beds regularly. Or, you can grow them in large containers. Good luck!
The University of Idaho Cooperative Extension suggests burying 14-inch-wide strips of aluminum or galvanized steel flashing (used in roofing) around the outside of the garden beds. In addition, be sure to remove any suckers that pop up outside the growing area. Some people have success if they rototill and/or mow the area around the growing beds regularly. Or, you can grow them in large containers. Good luck!