Eric from Lexington, Kentucky writes
My 2,700 sq./ft. backyard is 30% Bentgrass and 70% healthy and thick tall fescue. I want to kill as much Bentgrass as possible and overseed my lawn this fall. The Bentgrass patches I can't even see the soil for the amount of thatch. Should I spray Tenacity @ 3 apps, dethatch, then over seed? Or should I dethatch, spray @ 3 apps, over seed?
In general, we would recommend killing the undesirable plants and clearing out the dead plant debris before dethatching and then reseeding the lawn. Dethatching will be easier and you will get better germination with your new seed when the ground is better prepared for it. You can learn more about these treatments in our Do My Own Lawncare Video Series, too. You can find them on the bottom of our Lawn Care Guides page here.
Answer last updated on: 08/04/2017