Below are links to some of the resources cited in First Green lesson plans. (Click on the book titles to go to the vendor for purchase.) The vendor links are for your convenience. Feel free to obtain from other sources.
Reiley, H. Edward., and Carroll L. Shry. Introductory Horticulture, 7th Edition. Clifton Park, NY: Thomson Delmar Learning, 2007. Print.
Ingels, Jack E. Ornamental Horticulture, Thomson Delmar Learning, 2000. Print. ISBN-13: 9780766814172
Encyclopedia of Bugs, by Miles Kelly Publishing. ISBN: 9781782094456