Invasive weeds block out Pittsburgh’s Grand View

Steep hills, herbicide bans and human disturbance create ideal conditions for invasive species to take over. Conservationists cannot keep pace.    Story by Eric Jankiewicz. Art by Tim Robbibaro. NewsWorks Lab contributors.   Visitors to Pittsburgh who stand on the overlook beneath Mount Washington’s flagpole this fall are more likely to see a vista of surrounding treetops and …