Preen

Hmmm... I no longer use chemicals on my lawn, I want a pet safe lawn.

Most weed preventers must be put down after a rain or early morning dew. The grass must be wet for the chemicals to stick to the weeds for them to do it's job. Weed preventers take a week or two for them to it's job. Read the label if this the case for preen.

Most fertilizers need to be put down dry, just before a light rain so the fertilizers can be soaked into the ground. A heavy rain may wash the stuff away.

Did you apply these methods?

Also... Grab grass is not a weed, it is grass and different stuff is needed.

Sure did, Used the irrigation system for about 30 minutes after application.

While grass( not crab but something awful) is one of my biggest problems I wasn't expecting Preen to do anything about that. It is all the other stuff I thought it would help. I suppose I could be being impatient but its not going anywhere so maybe it will work a bit eventually. It has been 2 weeks since the first application, about 1 since the second.

-snip-

I'm pretty sure you're just trolling, here--- but just in case someone comes along that cares-- here are the application instructions from the manufacturer;

I guess you haven't been around the 14 years here I have been then. And thanks, but the instructions come on the container.

My guess is you were too late. I use Preen in the flower beds to keep down weeds and it works great- but I put it on just after temps warm up above freezing. If the weed seeds have already sprouted in the ground Preen won't do anything to them.