Is there an organic way to control grass in a vegetable garden?

Controlling grass in a vegetable garden without synthetic herbicides can take some work, but several organic methods are effective. For small areas, dig out the grass with a shovel, going deep enough to remove as much of the root system as possible. Another option is to lay cardboard over the area and cover it with mulch to block sunlight and smother unwanted grass. Concentrated acetic acid is another organic herbicide option, but it works only as a contact burn-down, damaging the plant tissue it touches without moving into the roots. This makes it less effective on perennial grasses such as Bermuda grass and means repeated applications may be necessary. Because acetic acid can damage vegetables and other plants it contacts, careful application is important.

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Weed Control in the Vegetable Garden