ID this BIG, spiny weed please
Hello! I have several of these plants growing in a part of my garden that I have never seen prior to this year. I have let them grow for a while hoping that I would recognize them or they would flower. I hope the pictures are good enough, I don't have the best camera for closeups. So far they haven't flowered. I've photographed the largest specimen. There's a stray vine in the picture but I'm interested in the upright plant with symmetricla branching.
Please let me know if I should look at the plant more carefully and report back with specific details. I had a bird feeder in that location over the winter so i have a few giant sunflower volunteers in the area as well. At least i know what those are :-P