Answer: You might enjoy checking out National Gardening Association's web site; here is the address for the Kids and Classrooms page:
The Growing Ideas newsletter is filled with information about using plants in the classroom.
NGA sells a 28 page book called "Guide to School Greenhouses", as well as a general guide for greenhouse growing called "Greenhouse Gardener's Companion". You can order these via NGA's storefront at http://store.yahoo.com/nationalgardening/index.html or by calling 800-538-7476.
I hope this helps!
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