How to Use Round Up Weed & Grass Killer


Roundup ready-to-use weed and grass killer is a point-and-shoot spray application that can be used to eliminate weeds and grasses. The product enters through foliage and moves to the roots, killing weeds and grass by stopping the function of an essential enzyme that is found in plants. Weeds or grass treated with Roundup will turn yellow within hours and be dead within one to two weeks.

Step 1

Apply Roundup when the weeds and grasses are actively growing. The best application time is during warm and sunny weather, above 60 degrees F. Spraying Roundup on cloudy days that are as cool as 50 degrees F. also can produce effective results.

Step 2

Spray the weed and grass killer when the air is calm. Protect adjacent plants with a piece of cardboard to block natural drift from the spray.

Step 3

Adjust the nozzle to the preferred spray setting: foam or spray.

Step 4

Spray the grasses or weeds until they are soaking wet or covered with foam.

Step 5

Wait at least 10 minutes after Roundup has been applied before watering the surrounding plants. Roundup Weed & Grass Killer Ready-To-Use Plus product label offers rainproof protection that states rain or watering 10 minutes after application will not wash away effectiveness.

Step 6

Plant ornamental trees, flowers and shrubs at least 24 hours after applying the weed and grass killer to an area of the garden.

Tips and Warnings

  • Wear gloves when applying any pesticide. Avoid contact with eyes and clothing. Allow people and pets to enter the application area only after the spray has dried.

Things You'll Need

  • Gloves


  • Roundup Website

Who Can Help

  • Alternative Organic Weed Killers
Keywords: weed killer, grass killer, pesticide

About this Author

Katherine Kally is a freelance writer specializing in eco-friendly home improvement projects, practical craft ideas and cost effective decorating solutions. As a content creator for Demand Studios and private clientele, Kat's work is featured on sites across the web. Kally holds a Bachelor of Science in psychology from the University of South Carolina and is a member of the Society of Professional Journalists.