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Roundup Pro Biactive Instructions

Updated February 21, 2017

Roundup Pro Biactive is a nonselective herbicide manufactured by the Monsanto company. The main ingredient in the product is glyphosate, but the herbicide contains other patented ingredients that bind the herbicide to plant and weed surfaces. The result is a long-lasting herbicide that remains on weeds even after repeated rainfalls. Applying Roundup Pro Biactive can be done with traditional sprayers as long as the proper dosage is used.

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  1. Wait until weeds are actively growing before you apply Roundup Pro Biactive. The product label recommends the following application times. Perennial grasses should have four to five leaves that are 10 to 15cm long. Perennial broadleaved weeds should have flowers. Annual grasses should have at least one leaf. Annual broadleaved weeds should have two or more leaves.

  2. Fill a garden sprayer or back sprayer with 100ml of Roundup Pro Biactive and 1 gallon of water. Screw the top onto the sprayer and shake it gently to mix the solution.

  3. Point the nozzle of the sprayer at the undesired weeds, and spray them with the Roundup Pro Biactive solution until they are soaked. Aim the sprayer only at the weeds, since the herbicide will kill desirable vegetation as well.

  4. Wait two to three weeks and then examine the weeds to ensure they are yellowing or have brown spots. If the weeds remain green and thriving, reapply the same amount of Roundup Pro Biactive.

  5. Tip

    Roundup Pro Biactive is for use on lawns, roadsides, and any other non-crop land area. Roundup Pro Biactive does not control horsetail weeds immediately. This weed requires multiple applications. Although the product resists rain once it is dry, it should be applied when no rain is expected for at least six hours.


    Do not mow the grass or in any way disturb the weeds during the two- to three-week waiting period or the herbicide will not be as effective.

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Things You'll Need

  • Garden sprayer or backpack sprayer
  • Water

About the Author

Kimberly Johnson

Kimberly Johnson is a freelance writer whose articles have appeared in various online publications including eHow, Suite101 and Examiner. She has a degree in journalism from the University of Georgia and began writing professionally in 2001.

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