For the past couple years I've been batteling this weed all over my garden. I will carefully pull the plant along with it's full root system and in no time new ones take it's place. First, can anyone tell me what its called? I thought it was a colver, but when I look up colvers I can't find any examples at all. Second, how do I kill it without killing the rest of my plants??

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thanks for everyone's help!