Answer: I'm not familiar with this weed, but usually heavy mulch is a good organic option for the control of most persistent perennial weeds. Try layering 8-10 pieces of newspaper with straw or hay to smother the areas between plants. Alternately, you could use mulch that comes on a roll, and cut holes for planting. Mulch works very well in conjunction with irrigation in my garden.
You can build raised beds over the infested area, but first apply a thick layer of mulch below the bed so the weed won't come up through the soil into the bed. Good luck!
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