
We use 12 inch caulking buried like bamboo barriers around the outside of our beds. This is the only thing holding our aggressive herb rhizomes. Far better than any weed cloth, it won't smother garden plants, is easy to remove, recyclable and effectively controls the toughest perennial weeds. I ordered them by mistake and they responded quickly to authorize the return. In the end I chose to leave them because we have garden plants that would love to take up any border. It's wide enough to run and easier to install. If you try this in your own yard, use something hard to mark where you bury them so nobody steps on the curved top edges, which reduces efficiency and can lead to lacerations.

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