What Method Did I Use To Try To Eliminate Quackgrass? Once the quackgrass has died off completely, the It may be a good idea to first do a Google search with the keywords 'quackgrass botanical name'; the result is Elymus repens. When pulled from the ground, the roots break easily, and often pieces of the roots will stay in the soil after the plant is removed and eventually regrow. Applying a good nitrogen fertilizer can choke out the Quackgrass and enable your desired grasses to grow faster and outcompete the Quackgrass. A thick lawn prevents new seeds for finding space to establish. Quackgrass is a creeping perennial grass that is considered to be a weed. To thrive and look good it needs a very high level of maintenance, including frequent, short mowing and frequent fertilizing. But Zoysia grass will choke-out most anything, including new crabgrass. Get all the latest information on Solutions products,deals, and events. Misidentifying weeds in your lawn can lead to incorrect treatment methods which can cost you both wasted time and money. However, additional nitrogen applications will require increased mowing and should only be done while your lawn is actively growing in the spring or fall. However, the rhizomes of quackgrass may continue to creep along until they finally find a spot where they can send up a shoot. A lush and densely grown lawn will keep crabgrass from invading. Once you have applied your Certainty Herbicide, apply a second herbicide treatment after 10 to 14 days and then reseed once all the plant life has died.