Illinois
Cooperative Extension Service - Provides practical, research-based information
and programs to help individuals, families, farms, businesses and communities
in Illinois.
Morton Arboretum - according to their site, an arboretum is "A place for trees, a place for people, a place for fun." The site also includes a tree and shrub selection guide, pest control advice and a searchable library catalog.
National Wildlife Federation - search for natives useful for the garden,
identify trees and wildflowers or see which invasive plants are a
problem in Illinois.
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