Earth Partnership for Schools
This site is a diverse collection of resources for gardeners. Of their 70-plus forums, five focus on Wildflowers and Native Plants . They also provide a directory of related organizations and businesses , an interactive plant database, and more.
"The Orion Society is an award-winning publisher, an environmental education organization, and a communications and support network for grassroots environmental and community organizations across North America." (From the Orion Society web site.)