Tenacity is not labeled for quackgrass elimination. We do carry a similar product called Certainty that is a selective, post-emergent that is labeled to eradicate quackgrass. Please refer to the product label for full mixing and application for the best results.
For the best application times for your region, we recommend contacting the local extension office directly and speaking with the Master Gardener.
There is no specific time that you need to wait after using an herbicide like Tenacity before you can apply a fertilizer. As long as the turf is healthy and you are following the directions on the product labels for what you are applying, then you should not come across any problems. Please see our Lawn Care Schedule for additional tips.
Per the product label for Tenacity Herbicide: Do not plant any crop other than turfgrass species for 18 months after the last application of Tenacity or injury may occur.
Tenacity Herbicide can be applied any time before the weeds start to germinate. Weeds absorb Tenacity as they emerge from the soil. For the best time to apply pre-emergents in your county we recommend contacting your local cooperative extension office here. Crabgrass seeds will start to germinate when soil temperature are around 55 degrees, so you need to apply it before you have those temperatures for best results.
This will depend on the target weed you are dealing with in the lawn. If you have a thick lawn that would prevent contact with the target weed you should mow for better contact before applying Tenacity. It is recommended not to mow within 2 days before or after applying a herbicide.
Tenacity Herbicide is our most popular product for eliminating bentgrass from other desirable turfgrasses, but it does typically require multiple applications. Late summer/Fall applications will be more effective than Spring applications. If you are able to spot treat with RoundUp QuikPro, that is another option. It would still be ideal to wait at least 10-14 days after applying the Roundup QuikPro before raking out the dead plants and re-seeding those areas.
You can reapply Tenacity Herbicide after 2-3 weeks for post emergence control of actively growing weeds for best results. There should not be an issue applying lime after the application. We would encourage you to get a soil test to determine the pH level of the soil you are treating also. This can be done at your local cooperative extension.
Tenacity Herbicide should be applied before soil temperatures reach 55 degrees if using as a pre-emergent. If as a post you would apply when the target weeds are actively growing and healthy.
There should not be any issues using Tenacity Herbicide and Sedgehammer Herbicide at the same time as long as the turf is established and not under other significant stress. If you are using Tenacity as a post-emergent herbicide, then it is generally best to spot treat since it can cause some temporary whitening of the desirable turfgrass. Another option that you may want to consider would be Dismiss Herbicide, which targets both sedges and many broadleaf weeds.
Per the manufacturer, " Tenacity has been tested in tank mixtures with Barricade 65WG Herbicide (prodiamine), Vanquish® (dicamba), Turflon® ester (triclopyr), Spotlight™ (fluroxypyr), Quicksilver™ (carfentrazone), Basagran® (bentazon), Princep® (simazine), and AAtrex® (atrazine) for safety and efficacy on turfgrasses. Tenacity must be applied at reduced rates (4 fl. oz./A or less) if tank mixed with atrazine, bentazon or simazine. Other tank mixture partners may be safe but have not been tested. Turf managers wanting to tank mix Tenacity with other herbicides should test on a small basis for compatibility, safety and efficacy before treating large areas. See product labels for directions and precautions."
You can apply Tenacity herbicide on the day of seeding. Once you have seeded you will need to wait until the grass is mature. You can start applying a month before seeding so you can apply 2-3 applications before seeding.
Tenacity Herbicide is not labeled to control Poa Annua/Annual Bluegrass as a post-emergent application. The label only states that it could cause injury to it if sprayed. It is only labeled to be used to suppress poa annua when used as a pre-emergent. Please provide your desired turf grass for an alternate recommendation. Thank you!
It is not recommended to mix certain insecticides, herbicides, or fungicides with Tenacity Herbicide. You should wait to apply insecticides 7 days after treating with Tenacity Herbicide to avoid potential turf injury. Other ingredients in the fungicides or herbicides would be fine to use at the same time if there are no resttrictions on the product label.
No, Tenacity Herbicide must be used per labeled instructions or it could cause damage to your lawn if used otherwise. Applying Tenacity Herbicide more frequently than the label allows could cause unnecessary stress to your turf or worse, it could kill your desirable turf.
It is recommended that you do not mow 2 days before or 2 days after the application of Tenacity Herbicide.
Tenacity Herbicide is not labelled for wild strawberry control. Q4 Plus would be suggested for Wild Strawberry to treat for in cool-season turf.
When using Tenacity, 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 may be required depending on what weeds you are treating.
