Thank you all very, very much for your help and suggestions. You are all very appreciated. The problem weed turns out to be yellow nutsedge. I understand from researching it that products called sedgehammer, pennant, manage will all work to kill it, but shouldn't be used in the veges. I think we have worsened the prob by how we have pulled it over the years, breaking the rhizomes off. We have a very healthy crop of it this year. Hmmm, maybe its good in salad, LOL.