re: What is the best WEED AND GRASS killer I can buy or mix?

RM43 kills weeds up to one year

What is important when spraying chemicals that have residual is that you put the right amount of chemical over the area. Most people are used to spraying just Roundup or glyphosate and all you have to do with it is mix it right and spray it on the leaves.

I you want to kill something for several months use a product like Sahara or RM43 which are combination product BUT you have to pay attention to how much you put out per square foot not just how much you mix. It's not hard but it is important because you have to get enough chemical to the ground to have residual control.