Answer: There are a few ways to deal with johnsongrass. There's an elbow grease option -- dig out as much of the roots as you can. A month later, remove any roots you may have missed, locating them by the little sprouts that arise. Mow any johnsongrass you see elsewhere on your property to keep it from going to seed. Or, cover your garden area for a whole year with clear plastic. The summer sun will cook all the weeds and roots under the plastic, and deprive them of some moisture, too.
Another option is to carpet your garden with landscape fabric, cutting holes in the mulch to plant your vegetables. Use thick straw mulch over the fabric and around your plants. You may have to install drip irrigation to make sure your veggies get adequate moisture.
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