The City of Newton is under attack from alien invaders. They have come from far away and are taking over our back yards, parks, and conservation areas. Slowly and quietly they are creeping into our public open spaces, disrupting the natural balance of nature and crowding out our native plants Some of them, like purple loosestrife, are quite pretty but take over our wetlands; others like japanese knotweed grow tall extremely fast while spreading farther afield underground; still others are even sold at garden stores to unsuspecting customers. Well known author, lecturer and naturalist Peter Alden, from Concord, MA, presents a lecture and slideshow with a stunning display of the twenty worst invasive alien plants in the Newton area. You will come away from the presentation with the knowledge of how to recognize these plants and what some of the control options are. You will find out what is happening at the state level and in the legislature in how to deal with severe menace to our city’s biodiversity. 2007