Michael from Charlotte, Nc writes
Have had success with Tenacity in killing weeds, however weeds do grow back. Are you supposed to skip using the product during the summer, because you're likely unable to grow new seed until the fall? It seems like an on-going battle with the weeds, and curious if you're supposed to go after the weeds when you're able to replace it with grass. Otherwise you're wasting your time.
When applying Tenacity Herbicide for pre emergent contol of the listed weeds, temperatures should be around 55 – 65 degrees consecutively for 4-5 days. For Kentucky Bluegrass and Tall Fescue, Tenacity is able to be applied before, at the same time or directly after seeding and will not inhibit grass seeds from germinating.
Also, refer to the Weeds Controlled Chart on page 9 of the product label for the specific weeds you are targeting to see if they are marked as Supppressed, Controlled or Both when using Tenacity. It is possible that the weeds you are targeting are not suppressed with pre emergent applications and only controlled as a post emergent.
If applying as a post emergent with a Non Ionic Surfactant when weeds are actively growing, you would need to wait at least four weeks or until the new grass has been mowed twice, whichever is longer.
The key time to avoid spraying Tenacity on new seedings, either as a pre-emergent or a post-emergent, would be when the new seedlings have started to come up but are not yet established. Please refer to page 12 of the label for complete application instructions around seeding.
Answer last updated on: 07/11/2021
