The Sudbury, Assabet, and Concord Watershed Cooperative Invasive Species Management Area (SuAsCo CISMA), of which Weston is a part, has identified 16 priority invasive plants that are the heaviest invaders in our area and the most difficult to eradicate. These “Sour 16” invasive plant species are listed here, with links to SuAsCo CISMA’s fact sheets on each species, including a description, control recommendations, and alternative plantings.