Collin from Provo, Ut writes
Last fall I seeded with a Bluegrass/Tall Fescue mix, but got lots of weeds in many areas. It's now spring and I'd like to kill the weeds and lay more seed to fill in. Should I scatter seed and then apply Tenacity? Can I apply it once when I seed and once a few weeks later or would that stress the new grass too much? Should I apply it once, wait a few weeks and plant grass with the second application? Thanks for your help.
When using Tenacity Herbicide as a pre-emergent and seeding, you can apply Tenacity before or at the time of seeding for best results as long as you are planting a turfgrass that is listed as tolerant on the product label (Kentucky bluegrass and tall fescue are tolerant). 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. Once you see new seedlings, you would want to wait at least four weeks or until the new grass has been mowed twice, whichever is longer. Please refer to page 12 of the label for complete application instructions around seeding.
Answer last updated on: 03/15/2018