The Morton Arboretum in Lisle, IL is a great place to start when it comes to learning about trees. They have their own research facility & staff that work hard to educate the public & the industry on the latest developments in horticulture. They also recently published a new list of Recommended Species for Northern Illinois. Check out their website for more info about this great resource.

Morton Arboretum

Morton Arboretum Recommended Species List