Reference Material
Websites
Silvics Manual of North America
USDA Plant Database The United States National Arboretum Minnesota Wildflowers - A guide to Minnesota Flora http://www.missouribotanicalgarden.org http://www.pfaf.org http://www.wikipedia.com http://www.mortonarb.org http://www.hort.uconn.edu/plants/ http://www.jimwhitingnursery.com http://bernheim.org http://www.bakker-irl.com/ https://www.bachmans.com/category/TreesShrubs http://www.spaldingbulb.co.uk http://dendro.cnre.vt.edu http://www.thetreefarm.com/spruce-norway-columnar http://www.connonnurseries.com/ http://www.colostate.edu/Dept/CoopExt/4dmg/Trees/russian.htm http://tricitynursery.com/ |
Books
Trees and Shrubs of Minnesota (The Complete Guide to Species Identification) by Welby R. Smith
Manual of Woody Landscape Plants Their Identification, Ornamental Characteristics, Culture, Propogation and Uses by Michael A. Dirr and Bonnie Dirr |