The document classifies plants into different categories based on their life span, growth habit, climatic adaptation, water requirement, and use. It identifies three types of plant life spans - annual, biennial, and perennial. It also describes the woody and herbaceous growth habits, as well as tropical, temperate, and arctic climatic adaptations. Plants are further classified based on their water requirements and their uses, which include cereal crops, forage crops, root crops, and cover crops.