Corn gluten is natural and non-toxic. It prevents seeds from germinating – it won’t get rid of existing weeds (those you’ll have to pull or spray), it can inhibit more seeds from germinating. While effective, its application timing also has to be precise – you apply corn gluten in early spring and late fall.
Apply corn gluten to your lawn with a spreader – not by hand. Apply the corn gluten to a moist lawn but be sure that the corn gluten will stay dry for 48 hours after application. Allow 6 weeks before/after overseeding your lawn with grass seed, as corn gluten will inhibit the germination of any grass seed you put down. Apply corn gluten in April – May depending on weather – before the Forsythia finishes blooming.