Annual crabgrass is fairly shallow rooted, if the roots you have go much deeper than 6 inches what you have may not be crabgrass. The stems of crabgrass tend to want to lay flat on the ground, it what you have does not do that you may not have crabgrass.
You need to properly identify what you do have.

Here is a link that might be useful: Crabgrass control

The bermuda grass in my L.A. yard has stolons down below two feet, so perhaps what you have is different than the crabgrass type Kimmsr refers to. Digging them out when the soil is soft, deep mulching and outgrowing them with my target plants are somewhat useful, but I have never found an organic method for killing the deep runners.

here's what it does if i don't pay attn to it for a couple of weeks. LOL
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here's what it looks like when i pulled it out, with some long roots. i had to have tabor "my son> hold it up LOL but this is a small one, just to give ya'll an idea what this crud is like. and some have really thick stems!!
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do ya'll have any idea what kinda grass it is?? by chance and how to kill this stuff?? its all over my garden and everywhere else in my flower beds. i don't want to use any heavy un organic things. so far i've been using newspapers, and i put 5 of them down, overlapping and them things grew right on up through them!! i was never so amazed in my life!! i have some osb down in an area, and it still grows, i don't mean like a month later i lifted the board, i'm talking 3 months later. this is some stuff on steroids!!! LOL its just crazy!!! LOL what are your target plants??

That looks to me like Quack Grass, an extremely difficult invasive grass to get rid of. I put in barriers to keep the stuff out of my planting beds and don't concern myself about what grows in the lawn. There is nothing that will kill Quack Grass although mechanically pulling it out of some of the places it grows helps keep it in control.

yes this stuff is definately quack grass from all the stuff i've been reading!! ok, now its' perennial, and i get that, so i'll have to keep it all mowed low to make sure ther's no seeds? its mainly in the garden's area's. only the stuff that's been tilled up. is there a organic thing i can use to make sure it don't come up next year? by chance? or maybe i can get hubs to let me burn off the garden area??? LOL would that help any??

The first raised bed I made in 2004 I abandoned last year and covered with cardboard, in lieu of digging all the quack grass out. I let it sit for a year and hoped for the best. Uncovered it this spring, still lots of quack grass growing! The darn stuff doesn't seem to need light. Anyway, a year of smothering didn't do it. It is my worst weed, I am sorry to say I have no advice except pull it out on wet days. I think tilling it just makes lots of baby quack grasses.

Marcia

i'm kinda learning that, LOL i uncovered it from the osb and it was still there, it grows right up thru alot of the newspaper!! i never had this problem til we got our part of the yard tilled for a garden area. as deep as the tilling goes is as deep as the roots to this stuff has been, that' ive seen, too crazy!!

make friends with the quackgrass and it will leave all on it's own :D really i have the same problem I have quackgrass in with my creeping charlie and wild cucumber vine, can't seem to kill any of them off