Tenacity Herbicide is not labeled for coltsfoot. You can see the article below from Washington State where they have done studies on the plant and the recommendations for control. There do not appear to be any herbicides specifically labeled for this weed currently.
Coltsfoot Weed
https://www.nwcb.wa.gov/weeds/european-coltsfoot
Tenacity would be applied as a pre-emergent in spring when soil temperatures are about 55 degrees. This will vary depending on your location, so we advise to reach out to your local extension office for advise on perfect timing in your area. Keep in mind that Tenacity only last about 30 days in the soil when applied as a pre-emergent. So if you are not overseeding your turfgrass, then we recommend selecting a different product such as Barricade 4L.
The product label for Tenacity Herbicide only states it is safe to be used on perennial ryegrass. There is no mention of it controlling Italian ryegrass, so I would not suggest using the product to control that particular weed.
Tenacity is usually pet safe as soon as it is dry. However, chickens are different and we would recommend reaching out to your vet for more information on what to do. Or you can reach out to the manufacturer for more information as well: Syngenta 866.796.4368.
Tenacity Herbicide can be used for pre-emergent control once the soil temperature in your region reaches 55 degrees Fahrenheit, and can also be used for post-emergent control if weeds are actively growing. You can refer to our Lawn Care Schedule for Warm Season Grasses for more information on the best timing for treatments on your specific lawn type. You may also reach out to your local cooperative extension office for timing application advice specific to your area.
If you are applying it as a post-emergent herbicide, then Tenacity Herbicide should be applied when there is no rain in the forecast for 24 hours. If you are using it as a pre-emergent, then it would need to be watered in and could be applied before rain as long as there is not so much rain that the application would just get washed away.
We would not recommend using this product on dormant centipede. If the Tenacity Herbicide is used on semi-dormant grass, it may harm the turf. Tenacity also does not have very good cool-weather performance as a post-emergent. If you would like to share some of the specific weeds you are targeting, then we may be able to better assist you.
Tenacity Herbicide is labeled for pre and post emergent control for specific listed weeds. Please refer to the Weeds Controlled Table on page 9 of the product label to see if your target weeds are controlled by pre and/or post emergent applications. When appying Tenacity Herbicide for post emergent control of actively growing weeds, a Non Ionic Surfactant should be used for best results.
If you are applying Tenacity Herbicide for a crabgrass pre-emergent, then you would apply in late early spring before soil temperatures reach about 55 degrees. Keep in mind that if you are not overseeding in the spring, you usually want to use a different pre-emergent with longer soil residual or add another one for longer and more complete weed prevention.
We have more information in our Crabgrass Pre-Emergent Guide here.
If you notice on Tenacity Herbicide’s product label, there are two different rates for application. There is a broadcast rate- meaning spraying the entire surface of the property, and a spot treatment rate. Spot treatments are often a different use application than for broadcast, especially for a unique product such as Tenacity. The main broadcast applications being made are going to be used as a pre emergent. The broadcast applications are not best for post emergent control, and the manufacturer recommends spot treating when going after existing weeds. Controlling an existing weed and preventing weeds from seed germination will be two different application rates, and one uses a surfactant during treatment (post emergent) and one does not (pre emergent).
Also, you would only be calculating per gallon of water if you are doing a post emergent spot treatment. Pre emergent applications will have varying water volumes based on a customers turf type, density, application equipment, and application speed. This means you are focusing on an amount of chemical per square footage/acreage, and not per gallon. The water is merely the carrier to get the small amount of chemical distributed evenly across the correct amount of space to yield the intended results from the product. For many, a pre emergent application will vary from 1 gallon to 3 gallons of water per 1000 sq/ft.
If you do not know how much water you will cover 1000 sq/ft or an acre with, you can calibrate your equipment by using only water first, and mark off a 1000 sq/ft section of yard. Walk as if you are applying it with chemical in a way that seems like sufficient coverage for your lawns needs. When finished, look to see how many gallons of solution you used, and then you can move forward with determining how you need to mix it based on this information for your 4 gallon tank.
Tenacity Herbicide is safe to use in a yard where pets and wildlife frequent as long as they are out of the area during the application. They can safely return after the area has dried typically after a few hours.
Tenacity Herbicide should only be used on St. Augustine grass that is grown on sod farms. It cannot be used on St. Augustine in residential lawns.
Unfortunately, there is no herbicide that will get rid of weeds permanently. Tenacity Herbicide, like other herbicides, can be applied up to 3 times a year, at 2 to 3 week intervals, on a yearly basis as long as you do not go over the max annual rate per area. It does only last up to 30 days as a pre-emergent application. It may be possible to eventually see reduction of weeds but keep in mind that the elements as well as birds can eventually introduce new weed seeds into your yard.
Whenever a lawn has large amounts of fine fescue its recommended to not use Tenacity unless some damage can be tolerated. Typically applying it as a pre emergent will lead to less harm than using it as a post emergent on a sensitive blend. We'd suggest applying the Tenacity as a pre emergent first, then wait 2-3 weeks to seed. Or seed and apply Tenacity 2 weeks after seeding.
No, Tenacity Herbicide should only be applied to the turf grasses listed on the product label.This product cannot be used in or around edibles.
Tenacity Herbicide should not be applied to ornamental beds or areas where you intend to plant anything other than listed turfgrasses within at least 18 months, per the product label. We recommend you do not apply Tenacity where you intend to plant ornamentals or that you create raised beds or remove the soil where Tenacity may have been applied.
There is no wait time to seed when using Tenacity alone, but Speedzone Herbicide requires 2 weeks from day of the application before seeding, according to the product label.
That would depend a little bit on what kind of soil conditioner you are applying and how it instructs you to use it. If its a product that needs to be incorporated into the top layer of soil or applied in any way that would disturb the Tenacity barrier, you would need to have either applied it before the Tenacity, or about 30-45 days after. Tenacity as a pre emergent only lasts about a month in the soil so after that time you could safely apply it if it requires the barrier be interrupted. If its just applied to the top of the soil and watered in, etc you can apply it within a few days of the Tenacity treatment.
Tenacity Herbicide is not labeled for sandburs.
