I tried these last year but I made two mistakes; many were too small in diameter and they were too tall. Since the goal is to provide a barrier to those pesky cutworms I made them shorter so the roots can mature without being restricted. They also have a vertical slice in them so they will be easy to remove once the danger is over and the plants are well established. Remember cutworms travel just below the surface and wont climb over the lip. They totally worked last year to prevent the plants from being chewed through. Try to go organic and natural as often as you can!!