I've been trying to grow a food plot for awhile now, in PA, but am having weed problems. The question I have is, can I spray the food plot in the spring, and plant in the fall without having weeds return? See, I live in N. Carolina, and I am only there three times a year. I want to kill the weeds when I come up for turkey season, then plant in October when I return. WILL THE WEEDS RETURN???? Thanks for your help.........