Yes, Tenacity can be applied after 2-3 weeks from seeding.
You would want to wait 24 hours after the application of 1 product before applying the second product.
Since Tenacity Herbicide requires a surfactant as a post-emergent, we would not advise mixing it with a product that does not require one. If both products require a surfactant, you would need to a jar test to see how they both react together. Keep in mind that as a post-emergent it can only be spot treated & not blanked sprayed the way other post-emergents can
Tenacity Herbicide is best applied 2 weeks before planting/seeding a lawn or wait at least 2-3 weeks after seeding to apply. When pre-germinating and planting in the area we would recommend waiting at least 4 weeks to apply so it is established.
Tenacity Herbicide cannot be used on home lawns that have St Augustine. It is only for use on St Augustine in sod farms.
Tenacity Herbicide is not labeled for clump fescue, and it is safe for tall fescue.
Ideally, you would not want to put a fertilizer down when the lawn is getting ready to go dormant. If anything, an application could be made now in early October as your last treatment for the year. Tenacity would not be effective on lespedeza (japanese clover) at all as its not labeled for it. Southern Ag Atrazine is labeled for lespedeza and is safe for use on Centipede lawns if used as directed. Another option is Fertilome Weed Free Zone.
Tenacity Herbicide can be applied at the same time as seeding (unless grass is more than 20% stand of fine fescue). If application cannot be done within 7 days of seeding you would need to wait a minimum of 30 days, or until the seed has emerged and been mowed at least twice before applying to the lawn.
According to the Tenacity product label, you will need to mix 1 tsp of product + 3 tsp surfactant with 2 gallons of water for spot treatments applied at a rate of 1 gallon per 1,000 sq ft. It is advised to use a dye like Turf Mark Blue with it so you can make sure to not overlap if you plan to do a broadcast application on the property. Repeat applications can be done after two to three weeks for continued post emergent weed control.
It would be best to wait to apply Tenacity Herbicide until the grass has completely dried before the application. Be sure to mix in a Non Ionic Surfactant when doing post emergent applications.
For post emergent applications with Tenacity Herbicide with adding a Non Ionic Surfactant, the product label states to wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before treating actively growing weeds.
For pre emergent applications with Tenacity Herbicide, apply Tenacity before or at the same time of seeding for best results. 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 product label for complete application instructions around seeding.Tenacity Herbicide is not labeled for quackgrass as a pre or post emergent. Unfortunately, we do not currently carry any products that are labeled for quackgrass that are safe for use in cool season grass.
We would recommend spot treating with something like Roundup QuikPRO and then reseeding any bare spots after 2 weeks.
View our Quackgrass Treatment Guide for more information.
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.
Any pets (including chickens) would need to be kept out of the area while spraying Tenacity Herbicide and kept out until the application has completely dried. Once dry, it would be safe to allow pets and chickens to resume normal activity.
Please view the full product label for more information.
To control nimblewill, start applying Tenacity in the spring (late-April) with a nonionic surfactant. You will need to make two or three applications 2-3 weeks apart. You will use it at the 5 oz per acre rate per the label. The product does have a yearly maximum use rate, and the label states "do not apply more than 16 oz of Tenacity per acre per year or per crop (equivalent to a maximum of 0.50 lb of mesotrione per acre per year).You can also apply Tenacity in late summer and fall, but you should initiate them by August for best results. Good cultural practices on your lawn can help reduce its ability of coming back as well.
You do not have to remove dead plant matter after using Tenacity Herbicide. However if you plan to overseed, then it is a good idea to rake out dead plants since you may need to dethatch or aerate before putting down your new seed.
When using Tenacity Herbicide as a post emergent application you are only spot treating the weeds directly per the product label not broadcasting across the entire lawn like you would when applying as a pre-emergent. It is recommended to apply when no rain is expected within 24 hours if treating active weeds so it has enough time to dry and be absorbed by the weeds. For pre-emergent applications you need to water it in so it gets down in the soil to create the barrier.
Tenacity Herbicide is best applied right at the time of seeding or close to for best results. It can be applied later if needed for the turfgrasses listed on the label with the following precaution: Avoid spraying on newly germinated turfgrass plants. Wait until the newly germinated turf has been mowed two times or four weeks after emergence (whichever is longer) before making a postemergence application. It can be applied at anytime temps are below 85 degrees for post emergent control.
Foliage of treated weeds cease growth after application of Tenacity Herbicide, then turn white (loss of chlorophyll) and death may take up to three weeks
