The document classifies plants into different types based on their size, stem properties, and where branches appear. Herbs are small plants less than 1m with green tender stems and few branches. Shrubs are medium sized from 1-3m with thin hard stems and branches near the base. Trees are the tallest over 3m with thick hard brown stems and branches in the upper part. Creepers have weak stems and spread along the ground, while climbers climb with support.