There is Houttuynia Cordata or Chamelion Plant ground cover going ramped all over the beds. We have tried roundup and trimec but this stubborn gound cover grew back. There are desirables in the area like trees, hydrangeas and lillies. Does anyone know a good trick on how to get rid of this?. Its not a weed but it is much too invasive. If you dig it out and leave 1/4" of root, it will continue to grow and multiply. Help.