The product label of Crabgrass Control Plus 0 - 0 - 7 with 0.37% Prodiamine Herbicide states, "Most effective weed control will be obtained when this product is activated by at least 0.5 inch of rainfall or irrigation, or with shallow (1 to 2 inches) incorporation, prior to weed seed germination and within 14 days after application." The label does not specific what amount would be considered too much, however, if you are expecting consecutive days of heavy rainfall, we would suggest waiting until this has passed.

Answer last updated on: 03/15/2023