How much time should I wait after mowing to apply 2,4-D? I have a yard that is 70% Dandilion and milkweed mix that I am trying to kill off? Also any better recommendation on a better product. I was told 2,4-D would do the trick. I am using Agri Star 2,4-D Amine 4 active ingred are Dimethylamine Salt of 2,4-Dichlorophenoxyacetic acid 46.8% other ingred 52%. Thanks for any help.