What are weeds? Why do they exist and how can we make use of them? What roles do these plants play in our ecosystems? There is a vast difference between Japanese knotweed and a native violet or goldenrod. Join Dan Jaffe, photographer and author of Native Plants for New England Gardens, at Garden in the Woods on August 8 from 1 – 3 for a fascinating discussion about which weeds to love and how to avoid the rest. $26 for NPT members, $32 for nonmembers. Register at www.nativeplanttrust.org.