Roundup and Roundup ProMax (the updated version of Roundup Pro) are products for killing weeds and unwanted grasses. The major difference between these two products is the manufacturer. Roundup is produced by the Scotts Miracle-Gro Company, and Roundup ProMax is made by Monsanto. These products also differ in certain features. Both of products are available at home improvement and hardware stores.

Bottling

Roundup ProMax is sold only in a concentrate, and it comes in a 1-gallon jug or a 30-gallon drum. A separate sprayer will be needed to work with ProMax. Roundup comes in pre-mixed and concentrates, and is available in pre-mixed bottles with an attached sprayer. Roundup is available in aerosol cans of 16 or 22 oz., including the Roundup Weed & Grass Kill Sure Shot Foam. Bottles are available in sizes from 16 oz. to 3 gallons.

Applications

Roundup Weed & Grass and Roundup ProMax attack the same weeds and tall grasses. Roundup also has a product that specifically that targets and kills poison ivy and tough brush. Both products must be applied during the growing season. Roundup ProMax can be used during the non-growing season on fescue grasses, but only if the grass is at the four- to six-leaf stage.

Active Ingredients/Guarantees

Both products use glyphosate as the main active killing ingredient. Roundup ProMax comes with a 30-minute RainFast warranty, which ensures that rain will not wash away the product. Only certain Roundup products have waterproof guaranteed. Roundup Weed & Grass Killer Ready-To-Use Plus is waterproof in 10 minutes, and the concentrate mixtures are waterproof within 30 minutes. With both products, actual coverage depends on the number of leaves in the lawn.

Considerations/Warnings

Neither of these products should be sprayed on desired plants or trees. Roundup and Roundup ProMax kill all the plants that they come in contact with. Always use these products on warm days, usually when temperatures are more than 60 degrees Fahrenheit. This ensures that the product penetrates the roots of the weeds and grasses, which then can take up to two weeks to die.