Environment
LETTER: Invasive Plant Spreading in Watertown, Poisonous to to Some Animals
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The blooms of the black swallow-wort. The plant is poisonous to butterflies and other animals. By Nicole Gardner and Douglas Hood
Black swallow-wort is a non-native, highly invasive plant that is poisonous to butterfly populations and other animals, and which toxifies the soil to benefit itself and harm other plants. We need to act right now to stop its spread and protect the Monarchs, other animals, and other plants. Black swallow-wort can be found all around Watertown, sprouting up through and even strangling lush well-established perennials and shrubs, along chain-link fences, in empty patches of dirt, or coming up between pavement cracks.







