I have removed a hedge of Quince from my garden, dug up as much root as possible, but it is still sending up shoots. It was growing against a fence in a very narrow strip of soil. I cut the shoots off each time I see them, digging down into the soil, but is there something more that I can do. I have read that Roundup or Glyphosate would kill the roots, so would that be the answer? I do not want to replant in the soil. Advice please.