This document classifies weeds based on different criteria including life span (annual, biennial, perennial), ecological affinity (wetland, garden land, dry land), soil type (light sandy soil, laterite soil, red soil), place of occurrence (crop lands, pasture lands, waste places), origin (indigenous, introduced), cotyledon number (monocots, dicots), soil pH (acidophile, basophile, neutrophile), morphology (grasses, sedges, broad-leaved), nature of stem (woody, semi-woody, herbaceous), specificity (poisonous, parasitic, aquatic) and provides examples for each classification.