One of the simplest, best things you can do for your lawn is apply a pre-emergent in March. Pre-emergent stops weed seeds from germinating in your lawn, flowerbeds, paths and driveways. We recommend Natural Guard Corn Gluten. Corn gluten meal is a byproduct of the corn milling process and a safe, non-toxic, effective alternative to chemical-based weed and feed products. Pre-emergent is applied in March before weeds begin to germinate. When you see the yellow Forsythia blooming, that's your cue. Corn gluten has a NPK ratio of 9-1-0. The nitrogen is great for feeding your existing lawn, and it also inhibits seed germination by drying out a seed as soon as it sprouts. It releases nitrogen slowly and feeds your lawn. Tips: Corn gluten needs to be wetted after applying, then allowed to dry for a couple days. Check the forecast for rain. Do not use in areas where you want to overseed your lawn. Corn gluten will inhibit all seeds from germinating. One application suppresses weeds for 4-6 weeks.