Brockville and Area Field Naturalists (Ontario, Canada)
Bruce Trail Association (Ontario, Canada)
Canadian Wildlife Federation Gardening Program NEW!
Federation of Ontario Naturalists (Canada)
Gardening Events in the Horseshoe Area (Ontario, Canada)
Garden Forum
Kitchener-Waterloo Field Naturalists
Monarch Watch
National Wildflower Research Center (Texas, U.S.A.)
Native Nurseries of Canada
Nature Conservancy (U.S.A.)
New England Wildflower Society (U.S.A.)
North American Native Plant Society & Wildflower Magazine
Society for Ecological Restoration - Ontario Chapter (Canada)
Toronto Field Naturalists (Ontario, Canada)
Wildflower Magazine
Wildflowers Worldwide