LM2 "Trimex"

[Shack]

Right now I am going to spot treat areas of my lawn that have had crab grass sprouting up. I am going to use Trimex.

My question is I would like to wait until the crab grass browns and then apply crab grass preventer that I bought last spring. I do not have ratings on fertilizer in bag at moment, but the preventer sure helped keep my lawn “Crab grass free” this summer until now and green for a great start to the season. I figure when the grass turns brown after applying Trimex, this should put me into late August, early September. This would be (I figure) prime time for me to apply another coat of fertilizer, plus ride me of crab grass going into winter. I feel it should help with the start of next year.

Again, does this sound like a good idea (never done it before) and would the mixing of Trimex and crab grass preventer possibly hurt anything? I know we are not scientists, but I figured you may have tried this or someone else possibly has.

Thanks

[LwnmwnMan2]

I'm assuming you mean Trime"c"??

I tried to do a google on Trimex, but couldn't come up with anything, unless you're mineral mining

Anyways, the Trimec isn't going to do anything to the crabgrass, since Trimec is a broadleaf herbicide, basically for dandelions, creeping charlie, clover, etc.

Drive is the chemical brand name that you need to use for a post emergent control of crabgrass.

Again, it's very possible that there's a new chemical that I don't know about yet as well..

As for putting down your round of pre emergent again this summer, especially if you have something left over, I would suggest maybe dialing back the spreader about 10-15%.

Usually the spring formulations are high on Nitrogen, especially with the pre emergents because the company wants you to believe that "wow, that fertilizer is really working, look how fast the grass is growing".

I say 10-15% because we're actually getting some rain now, so the risk of burning is pretty reduced, but we COULD still get some warmer temps.

As far as putting the one down, and then the other, you really shouldn't have any problems.

I WOULD suggest though, doing the granular down first, then you can go back over the top of the liquid application without having to wait for it to dry.

One last thing about putting down your pre-emergent for the crabgrass. Honestly, it's really not going to do anything this fall.

How pre-emergent works, is that the granuals will break down and create a "chemical layer" in your yard. What happens is, that eventually, that chemical layer will break down, that's why this time of year you'll start to have spotty areas with crabgrass, hence a previous post where I said to a different person where they may wish to do a dual application in the spring of the following year.

Your crabgrass will die out completely once we have a frost / freeze, the plant will not come back, but the seeds that it leaves behind will, hence the reason to put down the pre-emergent. I'd suggest to you as I did to the other poster, that if you're having areas, especially annually it's always the same area, that next spring, put down your pre emergent the normal time, then do a second application about 4-5 weeks later with another round of fertilizer / pre-emergent.

That will get you better results than putting down a pre-emergent now.

However, if you want to just burn up the bag of fertilizer because you have it, and don't feel like storing it over the winter, it's not going to hurt anything.

Although, as stewards of the earth, one really shouldn't put more chemicals into the ground than really necessary.....

Don't take that the wrong way, just something you're taught when you get your pesticide license from the state.

[Shack]

Sorry, it is Gordon's Trimec Plus. Kills crabgrass, yellow nutsedge & broadleaf weeds.

It works wonders for controlling crab grass in mid to later season. I was told about it from buddy of mine who owns Stover sod and landscape. You can only get it at nurseries (as far as I can find it). I use it in a pressure sprayer and treat small area's. I love it, because it does not kill any good grasses.

Thanks for the info!

[LwnmwnMan2]

Thanks for the follow-up with the name of the chemical.

It's one of the ways I can get caught up on all the different formulations that are out.

There's a product called Q4 now that does the same thing.

[Dragonsm]

Another place you can find it is Fleet Farm. This is my first year of using the stuff, and so far it has done well.