How to Seed Grass & Kill Weeds


Many homeowners and landscape designers plant grass seed to provide an attractive, living expanse of green in yards and parks. Other uses for grass seed include erosion control along roadways and slopes, as well as food for livestock. Unfortunately, weeds thrive in many soils intended for grass lawns. Incorporating weed elimination with seed planting techniques provides a weed-free environment for grass establishment. Reduce the competition for water and soil nutrients by killing weeds when planting grass seed.

Step 1

Clear your planting site of all existing vegetation. Remove weeds and other plants by pulling the entire plants from the soil. Dig out any remaining roots with a shovel. Rake up all debris to provide a clean surface.

Step 2

Test the pH of the soil in your planting site to determine the level of nutrients in your existing soil. Follow the instructions enclosed in the testing kit.enclosed instructions to obtain the soil sample. Add to the soil any nutrients or amendments recommended on your soil test results.

Step 3

Loosen the soil on your planting site with a rototiller. Break apart the top 4 to 6 inches of soil. Add your recommended soil amendments, following the manufacturer's instructions for proper application. Work the amendments into your soil with your garden tiller.

Step 4

Mix the granular pre-emergent herbicide with your grass seed in a large bucket. Follow the instructions provided on the herbicide container to determine the required amount of herbicide for the size of your yard.

Step 5

Check the seeding rate on your bag of grass seed. Set the application control on your seed broadcaster to match the seeding rate. Pour the grass seed and herbicide mixture into your seed broadcaster and spread across your prepared site by going back and forth over the area two or three times to provide even coverage.

Step 6

Apply a fine mist of water to your new grass until the soil is evenly damp. Maintain a slightly moist environment for the first couple of weeks. Most lawns require a light watering two or three times each day during seed establishment.

Step 7

Taper of the frequency of watering as grass seeds sprout and begin to grow. Thoroughly soak your mature grass once or twice a week, allowing sufficient time between watering sessions for surface soil to dry.

Things You'll Need

  • Shovel
  • Rake
  • Soil test kit
  • Rototiller
  • pH test kit
  • Soil amendments
  • Granular pre-emergent herbicide
  • Bucket
  • Seed broadcaster


  • University of Rhode Island: How Herbicides Work
  • University of Minnesota Extension: Seeding a Lawn
  • The United States National Arboretum: Turfgrass Questions and Answers
Keywords: plant grass, lawn weeds, lawn seed

About this Author

Laura Dee is a writer, artist, and the co-owner of Wallace & Wallace Copywriting,an online business which specializes in providing marketing materials and copy to various companies. She has written for Demand Studios since 2008 and is currently working on a series of childrens' picture books.