unprocessed – very fine, almost powdery in texture. Can be broadcast by hand, but for best results use a hand seeder. It will look like a layer of pollen on the soil. Must be applied directly on bare earth or around new plantings because it can’t work its way down through grass or mulch.

granulated – easiest to apply using a spreader. Can also be mixed with water into a paste to use as a patch for localized weed supression. The patch will keep weeds from sprouting while the surrounding plants fill in.

pelletized – can be broadcast by hand. This is an excellent treatment for lawns in spring and fall; a general application will add nutrients to your lawn while discouraging the growth of new weeds. Can also be applied on windy days.

Among the weeds controlled with pre-emergent application of corn gluten are common broadleaf weeds such as:

Dandelions, Barnyardgrass, Curly Dock, Green Foxtail, Black Nightshade, Orchardgrass, Shattercane, Purslane, Wooly Cupgrass, Giant Foxtail, Lamb’s Quarters, Buckhorn Plantain, Quackgrass, Velvetleaf, Annual Bluegrass, Creeping Bentgrass, Black Medic, Redroot Pigweed, Catchweed Bedstraw, Clover.

The three forms of corn gluten meal described above are comparable in effectiveness.

Cost: prices will vary by brand and quantity, but corn gluten-based products are a little more expensive than traditional chemical-based weed n feed products.