Roundup Mixing Instructions

Written by louise lawson
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Roundup Mixing Instructions
Roundup kills a wide variety of weeds, including dandelions. (danelion and blue sky image by Warren Millar from

Roundup is a brand name for a glyphosate herbicide produced by Monsanto Corp. It kills weeds without harming grass or other vegetation, making it popular with farmers and homeowners alike. Roundup is manufactured in both ready-to-use bottles and large, concentrated bottles that can be diluted after purchase. The concentrate produces more ounces of finished spray than premixed bottles, making it more popular and cost-effective.

Skill level:

Things you need

  • Gloves
  • Breathing mask
  • Goggles
  • 1-gallon garden sprayer
  • Water
  • Roundup concentrate
  • Measuring spoons

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  1. 1

    Determine what strength of Roundup is necessary to kill the weeds on your property. Delicate plants such as lantana can be killed with a weaker solution, while hardier plants like beachgrass require a strong concentration of herbicide for best results. Check the Roundup product label for a complete listing of appropriate concentrations.

  2. 2

    Put on protective equipment before mixing Roundup. Heavy work gloves and goggles should be worn to prevent chemical burns, and a breathing mask is necessary to keep from inhaling minute chemical particles.

  3. 3

    Fill a 1-gallon sprayer with clean, warm water. Use the measuring spoons to pour the specified amount of Roundup into the sprayer. For example, killing honeysuckle requires a 0.8 per cent concentration of Roundup. It takes 28.4gr., or 2 tbsp, of Roundup mixed with a gallon of water to produce a 0.8 per cent solution.

  4. 4

    Place the lid on the sprayer and shake gently back and forth to combine. Spray weeds early in the morning, so the product has a chance to penetrate to the root of the plant during the heat of the day. Spray the weeds again in a week if they still show signs of life.

Tips and warnings

  • Avoid spraying Roundup near animal troughs or feed pans. It can be toxic if ingested.
  • Don’t spray weeds on days with rain in the forecast. Roundup does have a one-hour rain warranty, but heavy storms will dilute the chemicals and render them ineffective.

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