Non-Synthetic - "Natural" Weed Killers: There are 3 primary "natural" products on the market: Corn gluten, acetic acid/clove oil combination (A 4th product was recently introduced with a "food-grade" 20.0% Acetic Acid), and fatty acid. Nature’s Avenger’s patented d-limonene (citrus oil) formula is a new fast acting and effective alternative - we’ll get into that later  

Corn gluten, acetic acid/clove oil combination (A 4th product was recently introduced with a "food-grade" 20.0% Acetic Acid), and fatty acid