University of Illinois
University of Illinois Extension: The Great Plant Escape
Detective Le Plant has taken you on an adventure through the world of plants. As his assistant, he has shown you the inner workings of seeds, flowers, and other plant parts. He has also shown you what is needed for plants to grow and be...
Colorado State University
Gardening & Horticulture in Denver: Gardening With Children
The section on plant projects for kids has lots of hands-on ideas for studying plant biology. Activities are included for stages from seed germination to growth. Geared more to the younger student.