Project AIMS (Activities to Integrate Mathematics and Science) has as its purpose the integration of subject matter in grades K-9. Field testing of the curriculum materials produced by AIMS indicates that this interpretation produces the following beneficial results: (1) mathematics becomes more meaningful, hence more useful; (2) science is increasingly studied and understood, with a significant economy of time; (3) there is improved quality of learning and retention; and (4) there is a dramatic increase in students' motivation and involvement. This teaching guide to plants for grades K-3 contains 26 lessons, each with a teaching instructions page with lists of materials, objectives and procedures, and reproducible worksheets for students. Topics include: (1) plant growth; (2) seeds, spores, and more; (3) plant needs; and (4) plant parts. Also included is a glossary, a list of the plant ideas from the California State Science Framework, a list of materials for the unit, and information on the AIMS project. (CW)