What makes a landscape design sustainable? The New England Wild Flower Society will hold a two-part seminar for people interested in learning how to design landscapes that follow an ecological paradigm, and that enhance a site’s beauty and utility. Landscape Architect and LEED accredited professional Tom Benjamin will define and discuss principles of sustainable landscape design, techniques to improve the ecological and human functions of existing landscapes, and how to approach sites with a variety of challenges. Discussion will include sustainable measures to improve your own projects, as well as a short trip to a nearby site that was designed for sustainability. Bring a bag lunch. The classes will take place Thursday and Friday, October 18 and 19, from 9 – 4 at Garden in the Woods in Framingham. $216 for NEWFS and ELA members, $254 for non-members. Co-sponsored by the Ecological Landscaping Association. Register on line at www.newfs.org.