Just joining this thread so the answer to my question could be in here somewhere and I just haven't seen it yet. But I am new to attempting to grow chufa, this is my first year making an attempt. I planted about 40 lbs. on May 15th and put 100 lbs. of 13/13/13 on it, got a ton of rain shortly after planting...now 2 months later, I can see what I think is the chufa but the weeds are very thick, especially on the edges (I planted on a highline). I feel like my only option is to spray it. Initially, I sprayed the area I was going to plant 2 weeks before disking and planting, and sprayed it with Eraser then. I don't think Eraser is what I need to use this time. My question is .. what do I need to spray the plot with now that will kill the weeds but will not kill the chufa plants that are there? I appreciate any feedback and help that you guys can provide.