OK, I sprayed some weeds this morning in the worst conditions so I might not have any grass in these areas but I am doing it for the knowledge that we will get from this little experiment. It was 90 degrees and humid when I sprayed. I also was lazy and did not want to mix a fresh batch so used what was left in my backpack which was sitting few days, but on the bright side it did not smell rancid (you will know what I mean if you have used it before and forgot about it for a few days) I will keep you up to date on whether I have any grass or not. I am using the 14-0-5. They also have a 5-0-3 for Summer use and has less N. I will keep you informed.