In July, the last known patches of Giant Salvinia, an invasive and aggressive aquatic plant at the Barnett Reservoir in Mississippi, were eliminated.
The vegetation was treated with multiple chemicals and then removed, but after six months of Giant Salvinia being absent from the lake, the cleanup team discovered the unwelcomed guest.
Apparently a stray piece survived the chemical treatments; and being a fern, a tiny piece can make a whole new plant and it can duplicate in size in just 48 hours. Over the course of six months, that piece can become the size of a cove.