Where to Buy Corn Gluten Meal in the Boston Area

Corn gluten meal (CGM) is a patented pre-emergent; only licensed sellers can market it as such. Iowa State maintains a licensee list (public.iastate.edu/~isurf/tech/cgmwebsite.html). In Boston: Carlson's Berkshire Nursery (Ashley Falls, MA) carries Fertrell's Organic WEEDZSTOP. "Preen Vegetable Garden Weed Control" (CGM formula) at Costco, Home Depot, Lowe's, Walmart, etc. "Supersoil Garden Guardian Mulch" (CGM) at Lowe's MA. Order online from Gardens Alive! (WOW Plus!) or other licensees.

Apply when forsythia blooms, on a dry day. Works 6 weeks. Also feeds grass as slow-release nitrogen. Don't confuse with other Preen products (not organic).