I think you have to have rain on prowl in less than 48 hrs or you wasted your $. Will be part of the research. I know it is used on og here in va, and many mix timothy with the og.
Good point!! I missed that in the label.
"Apply Prowl®H2O herbicide preplant surface or preplant incorporated (rain-fall, irrigation or mechanically) in late fall prior to planting edible beans(chickpeas [garbanzo beans], dry beans [including navy, great northern,red kidney, black turtle, cranberry, small white type], lima beans, snap beans, Southern peas [cowpeas], and sweet lupins) the following spring.Apply Prowl H2Oin the late fall when soil temperatures are 45° F orbelow but before the ground freezes.DO NOT pply when the air temperature is below 45° F.Rainfall or irrigation is required for incorporation and activation.Unpredictable weed control can be expected because factors such aslength of time between application and planting as well as uncontrollable weather factors will determine herbicide activity and longevity."