tenacity and overseeding timing

last year

Hi there! Bentgrass has taken over my lawn this summer and I recently paid a lawn care company a pretty big sum of money to treat the weeds with tenacity, aerate, fertilize and reseed with grass seed. They said this would all be done few over a few weeks time. They aerated last week and were supposed to put tenacity down today but I got home and saw huge patches where they put topsoil, seed and hay where the bentgrass was. They are now saying it is totally ok to spray the tenacity and immediately put topsoil and seed over it. They are saying the grass will still grow. I am suspicious and worried that I have wasted all this money - does this sound right to you guys?

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Comments (5)

gardengal48 (PNW Z8/9)
last year
Have you read up on the product at all?

" This formula can be used anytime during seeding including overseeding of established turfgrass, during renovation, or bare ground seeding. Weeds are expected to die and wither within 3 weeks from the application, turning the weeds white in color due to the loss of chlorophyll. Whitening of the turfgrass is common but temporary and typically occurs between 5 to 7 days after application and may last for several weeks. "
Susan 7a, CT
Original Author
last year
Yes, I did read that but was confused by it as it doesn’t make total sense to me. I’ve also read on other lawn forums that it is a 4 week process and this is also what the company told me at first…
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Susan 7a, CT
Original Author
last year
To clarify, I understood that you are supposed to have applied tenacity on bare soil and then seed over it vs. what they did which was just put soil over the lawn and seed it.
gardengal48 (PNW Z8/9)
last year
I'm not sure what's confusing about it. It seems pretty straight forward to me.

Tenacity FAQ's

I'm also not sure that you really need 3 applications now, especially as you are getting very close to the end of the window for overseeding. I'd probably wait to see how the overseed took and how well the single app of Tenacity worked and if necessary, reapply in spring.
Susan 7a, CT
Original Author
last year
They actually just called and said what you said - that tenacity can in fact be applied right before topsoil and seed. Unfortunately, they somehow forget to spray it! So we’ll probably have to wait until the spring