I've been using glyphosate to kill weeds at all my customers. Some of them don't/can't understand the mode of action and want it to "look" like it's starting to die. They've been watching too much tv I think. Anyway, I spray a lot of convenience stores too and they're full of concrete expansion joints as well as some mulch beds. Needless to say, I have to kill it all and make it look like it's dying. How do I mix glyphosate and 2-4,d. I've never really used 2-4,d before but I understand it can be mixed with glyphosate? I'm using a backpack sprayer btw.