The "dig-prevention skirt"
It's 1ft wide, and I use whatever I can find (concrete blocks are ideal though) to make sure it stays flat since I can't get grass to grow through it. Nothing has dug under once I put these down!!

It's 1ft wide, and I use whatever I can find (concrete blocks are ideal though) to make sure it stays flat since I can't get grass to grow through it. Nothing has dug under once I put these down!!