Will Trimec kill crabgrass? What are the right temps for application?

I have heard it works great to kill most all broadleaf weeds very nicely, but will it also kill grassy weeds, like crabgrass as well?





anyways, what are the right temps to apply it to the lawn?


It has been getting into the middle 80's for the past two weeks and been nice, but now for the next two weeks it will be getting much cooler, like low 50's for highs and close to freezing at nights!


Should I wait until after to apply??

Will Trimec kill crabgrass? What are the right temps for application?
First, recommending or using a herbicide for the control of crabgrass when that herbicide is not labeled for crabgrass is a federal offense. Trimec is not labeled for the control of crabgrass. That is because Trimec controls broadleaf weeds. Crabgrass is a grassy weed. Please do not try Trimec to control crabgrass.





Bispyribac-sodium (Velocity), dithiopyr (Dimension), ethofumesate (Prograss), fenoxaprop-ethyl (Acclaim Extra) and quinclorac (Drive) are labeled for post-emergence control of crabgrass.





Pre-emergence herbicides that control crabgrass should be applied when the soil temperature is 55 degress for three or more consecutive days. The post-emergence herbicides listed above must be applied shortly after the germination of crabgrass. Here in Illinois that is typically late May to very eary June. Follow the label whenever applying a herbicide. Good luck with your crabgrass problem.
Reply:Crab grass is a pain in the butt. This is because it acts like a weed, but is more like a grass. Trimec probably wont do too good on it, but if you already have it you could try it. Ortho has a crabgrass product but I can't remember if it is a killer or preventer. Still, it may not even work as most post emergent herbicides are really weak. More than likely you will have to deal with it or pull it up this year and then at the beginning of the season next year used Scott's with Halts Crabgrass preventer. If you do this before it comes up along with something like ortho or trimec then you be able to get rid of it. If your grass isn't already green and the crabgrass still hasn't come up then apply right away. The best time to apply is before it even gets a chance to come up. Good luck!
Reply:Trimec is a broad leaf weed killer,,not a grass killer.


Crabgrass is in the Grass family, so trimec won't work.


To kill crab Grass you can use Round-up, but that'll kill the good grasses too.


if you know someone in the Lawn Care business, ask them to get you a product called "Acclaim". Acclaim was designed to kill Crabgrass. Unfortantely your lawn will be "blotchie" (dead spots all over)





Your best bet is to put on a Crabgrass Preventative before the lilacs bloom. When the lilacs bloom it's too late to put on a Crabgrass Preventative.


Also keep in mind, where ever you use a crabgrass preventative, you can't plant regular grass seed. A Crabgrass preventative stops ALL seeds from germinating , not just Crab grass.