Before applying any weed and feed products, make sure you water your grass and mow it at least two days prior to administration. The Scotts Weed and Feed formulas must not be watered down before 24 hours pass by after application. Similar to rain, watering your lawn too early will wash away any of the products you have applied, no matter what Scott series they belong to. If the product is washed away, weeds will not die off effectively. Failure to follow proper instructions can also damage your grass badly.