Before flowering parthenium plants are collected and the materials are to be chopped into 5-10 cm length and spread into 10 cm height above the surface with the circle radius of 1.0 m diameter. Above this weed materials layer, 10 % of cow dung slurry at semisolid condition (10 % of weed materials weight) is sprinkled evenly and the sequential process is repeated for 5 layers. These weed materials are to be kept as such for 10 days for decaying purpose. After 5 days earth worm at 250-300 numbers are to be introduced into this decayed material. The compositing process to be continued up to 45 to 60 days for complete decomposition of parthenium.