Are the the thorny variety I have called saw briars or devil's whip? They are a real bugger. Not a practical solution, but worth mentioning, is that there are people who actually sell the knobby-looking roots of the kind I'm talking about. A few years ago, we were at a rendezvous of folks who are into Indian artifacts and flint-knapping. One of the vendors had this container of these funny looking roots, and I realized that's what they were. I must have a gold mine right here on this property, lol. We have lots of them, but they mostly grow along the creek, and not in the yard area.
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