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