Instructions for Crabgrass Preventers


Weed control and prevention are a constant chore in every lawn. Crabgrass is among the most persistent weeds to keep in check among all the grassy weed varieties. An annual weed, its seeds germinate in early spring when the soil temperature reaches 60 degrees Fahrenheit. Anywhere the soil may be in less than optimum condition, and where full sun is allowed to reach the ground, crabgrass will germinate and thrive. Timing and method of application are the most important considerations to preventing crabgrass from germinating.

Instructions for Crabgrass Preventers

Step 1

Select the crabgrass preventer to be applied to the infested area. Preventers come in granular form and are broadcast like fertilizer or seeds. Commonly, crabgrass preventers are pre-packaged with fertilizers so as to provide lawn or garden feeding while preventing the germination of crabgrass seeds.

Step 2

Multiply the length and the width of the area to determine its square footage. Check the crabgrass preventer label for the proper application amount per square foot. Usually a ratio of X pounds per 1,000 square feet is used.

Step 3

Spread the crabgrass preventer in early spring--just before the seeds begin to germinate. Once applied, water the product into the soil by applying a long, slow watering regime to ensure preventer is absorbed down into the soil. Crabgrass preventer allowed to remain on the surface of the soil will have little effect on the germinating seedlings.

Step 4

Apply the crabgrass preventer known as Siduron if new lawn grass seeds will be established later. Siduron is the only crabgrass preventer that will target only the grassy weed and leave the lawn grass seedling unharmed.

Tips and Warnings

  • Never allow children or pets to enter the area during or after application of herbicides to lawns or gardens.

Things You'll Need

  • Lawn spreader
  • Crabgrass preventer


  • Ohio State University: Apply Crabgrass Preventer Now
  • University of Illinois: Preventing Crabgrass Problems in Lawns
  • University of Connecticut: Crabgrass Control
Keywords: crabgrass preventer instructions, prevent crabgrass control, lawn crabgrass killer

About this Author

Damon Hildebrand is a retired U.S. Navy veteran. He has more than 15 years within the oil and gas industry in both technical and managerial positions. Hildebrand has been a technical writer and communicator for the last four years. He is a certified specialists in lubrication and tribology, as well as a certified maintenance and reliability professional.