Briars, brambles, blackberry, all the same..
It's free in Michigan, if you want blackberries, don't mow, easy as that.. I have to walk miles though that stuff every week.
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Jim the ones I have are thorn less. The berries get the size of quarters and are very sweet. Trapper
When I was in Rocklin, CA we had unwanted thorny blackberry plants near our house. I fought them with everything I had for about 20 years, but they just kept coming back.We have Himalayan blackberry here and that stuff is covering my neighbors lower half of backyard, I actually bought a machete to jump the fence and hack it back and make a buffer of 4’ or so so it doesn’t come over onto my property. Stuff is hard to get rid of.
Is what you have the Rubus ursinus?