Answer: This is the type of situation where an ounce of prevention is worth several pounds of cure. It's easier to keep crabgrass out of the garden than to get it out once it is established. Crabgrass is an annual that begins to sprout about the time the forsythia blooms, so one of the best controls is to apply a pre-emergence product such as Preen or Casoron. Another option is to use corn gluten as an herbicide. The gluten releases an enzyme that kills germinating seeds, and at the same time adds nitrogen to your soil. At this point you can continue to pull the weeds out, roots and all or try smothering them with several layers of newpaper or cardboard. If you can keep sunlight from reaching the bare soil any seeds in the soil won't sprout and by keeping the existing crabgrass pulled, you will eliminate additional seeds from falling onto the soil. Wish there were other options.
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