I've been spraying Drive XLR8 on CG and having good results with it............most times. I've also got plants that seem to show no susceptibility to the product. At this time of year, nearly all of these plants are mature. According to the label, that's even "better" than in their intermediate stage. I can't figure some of these out. And, it's starting to make me go Hmmmmm. Is this large CG? I'll readily admit that some of these grassy weeds run together (in my mind). But, I was pretty darned sure on this one. Hit it, again? I sprayed this plant a week ago Sunday. I sprayed it again, yesterday morning. I realize that's not much time (on the second app.). But, I really couldn't tell it had even been sprayed. I can post up some photos of other CG that's smoked from the same app..