There was a thread similar to this and the consensus was to spray the grass with Round-up if you don't want to fight it in your veggie garden.

I used thick card board and weed cover on top of the card board. On top of that I placed mulch to help hold it in place and help with drainage for the pots and the plants will not root into the ground.

Barb

I have some questions. How tall will the raised beds be? Do you have bermuda grass around (this pertains to the thread Carrie mentioned)?

I would remove the grass as much as possible and the put down a couple layers of cardboard and a bring in the dirt for the raised bed.

phoenix7801, the sides will be 10" and over a mixture of bermuda, saint augustine and everything weedy that comes up this time of year. Right now you can't see much grass, just the little matt like weeds.

If you don't kill the bermuda FIRST, it will be with you ALWAYS .........trust me on this. No amount of cardboard or whatever will keep it from finding a crack large enough to get through. It is tough stuff and should be wiped out first.

you MUST kill the grass first (round-up applied with a paint roller on a long broom handle). I did not do this with my first raised rose bed laid down on cardboard and paper, and it has been an endless grassy mess. No killing it now! Also, you will have to edge with a trencher edger to keep the grass from invading from outside bed.

I just put paper and cardboard over my bermuda. The new part only has one layer of paper, so we will see. The old part didn't get too many weeds last year. It had cardboard over the burmuda. I'll probably regret it later, but so far, so good!

Last year I just put several layers of newspaper down with about 3-4 inches of dirt on top and then mulch, and I really didn't have weed problems...

except one wild sunflower that came in a walmart veggie pot, I pampered it thinking it was a melon, by the time I realized what it was, there were so many bees and wasps in it I didn't dare go near it. That's when the morning glories made their move. I pretty much gave up on the garden at that point

I just finished prepping the same bed for this year and no grass, but a few weeds and wild morning glories that came up without any struggle.

I don't know if the grass around my yard is a less vigorous Bermuda than Carries or if the zone makes a difference or what but I am sold on the newspaper method, it worked well for me