I have a corral that has a lot of weeds (including poison hemlock, buffalobur (the ground is covered in this), milkweed, pigweed, ragwort, cocklebur, and more). The weeds have choked out all the grass. I will be bringing my horses home the first of June and have been trying to kill off all the weeds, as some are poisonous to horses. The corral is 30' x 40'. Two weeks ago I applied Weed-B-Gon. It had not rained in about 2 weeks, and it has not rained since. The temperature when I applied it was 76 degrees. The Weed-B-Gon made no difference at all. Yesterday I applied Roundup Grass and Weed Killer. The temperature was 74 degrees, we had not had rain in about 4 weeks, and have not had any rain since the application. There is still no difference in any of the weeds. I'm just wasting my money and it's adding up quickly! I can't find anything stronger at Lowe's, Home Depot, or Walmart. I've been told to use diesel to kill it all off, but I don't want to use diesel as I have cats that go through the corral to the barn and I will also be putting my horses in it. I'd also like to eventually plant grass back in it. Can someone tell me what to buy to quickly kill this stuff off and where to buy it? Thanks!