Wayland Town Crier 7/28/13: Invasive weeds create a sea of green on area rivers and lakes. When Lynn and Jane Joiner bought their Framingham home in 1980, one of the selling points was backyard access to the Sudbury River. But after more than 30 years of leisurely canoeing, the couple is now fighting an upstream battle. An explosion of Eurasian water chestnut is starting to choke the waterway to the point it’s nearly impossible to take a boat out.