Jay Vinskey gave a useful workshop on Underutilized Trees and Shrubs at the WMMGA Spring Garden Symposium last weekend. I attended because I may not be quite finished choosing shrubs for our new Greenfield garden and I was looking for more suggestions. Small trees and shrubs are the elements I am counting on to make this a sustainable, low maintenance garden. Vinskey’s list included trees like paperbark maple, tupelo, ironwood, redbud, stewartia, and pagoda dogwood. His shrub list…