Hi, I recently purchased a bottle of image from my local Ace hardware store thinking it would help with weeds in my yard (St. Augustine). Doesn't work very well. I was back in the Ace hardware today and saw a Hi-Yield brand of Atrazine and 2-4-D. Can I mix these two together in my pump tank and spray? I ask becuase I wan't to knock these weeds dead. I have dollar weed and other weeds I don't know the name of..... Thank you for your help.