Invasive species management is an on-going challenge for land managers as there always seem to be new or spreading outbreaks. On a recent afternoon, biologists working at a bog in Henderson County actually experimented with using a shop-vacuum to remove Japanese stilt-grass seeds, sadly to no avail. Also called Nepalese browntop or by its genus name, microstegium, in the United States, this Asian plant was first seen in the Knoxville area around 1919, and its suspected it was used as packing material for porcelain.