We would not recommend tank mixing Tenacity Herbicide with other herbicides like Empero when applying as a post emergent application. Tenacity is only labeled for spot treating when applying to actively growing weeds where others allow for broadcasting an area. Tenacity is only broadcasted when applied as a pre-emergent application.
Tenacity Herbicide will generally be rainfast 4 hours after it has been applied. The product needs to have time to completely dry. Once dry, it is considered rainfast, however, for best results, do not apply Tenacity Herbicide when rainfall is forecasted to occur within 48 hours. A surfactant such as Non-Ionic Surfactant for Herbicides would be a great option to use with Tenacity.
Ideally when preparing to seed you would want to clear the ground of as much thatch and debris as possible so that the seed you are applying can make direct contact to soil. If the seed is unable to reach the soil it usually will not germinate, so the cleaner the area the better for your desired results.
View our Cool Season Lawn Care Calendar Schedule for more information.
Tenacity Herbicide is best applied before temps reach above 80 degrees but above 55 degrees. After spraying with Tenacity Herbicide, the foliage of treated weeds cease growth after application, then turn white (loss of chlorophyll), and death may take up to three weeks. A repeat application is required after two to three weeks for improved postemergence weed control.
We would not recommend using them together in the same tank. We would recommend doing each on separate days. This way there is minimal stress on your lawn.
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
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.
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.
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.
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.
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.
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.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 is not labeled for clump fescue, and it is safe for tall fescue.
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
