http://4oops.com
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The Great Plant Escape:
http://www.urbanext.uiuc.edu/gpe/
Enature: http://www.enature.com
KidsGardening: http://www.kidsgardening.org/
Living Things: http://www.fi.edu/tfi/units/life/
Exploratorium: http://www.exploratorium.org/
Journey North: http://www.learner.org/jnorth/