Links

The Chicago Botanic Gardens
For expert, comprehensive information on just about any question you might have on gardening.

http://www.chicagobotanic.org/plantinfo/index.php

University of Illinois Extension
For information on pests and diseases of evergreens, deciduous plants and perennials.

http://urbanext.illinois.edu/focus/

Rutgers
For reliable deer resistance ratings on all kinds of plants.

https://njaes.rutgers.edu/deer-resistant-plants/