Punjab, a northwestern state of India, is one of the main agricultural states of the country which produces wheat, rice, and sugarcane in massive scale every year. The state is rich in terms of biological diversity. However, the invasion of alien species is posing a risk not only to the community composition but also to the agricultural economy of the state. Among several terrestrial invasives of India, mainly two species of family Asteraceae, Ageratum conizoides, and Parthenium hysterophorus that are native to South America, are considered as the most obnoxious weeds to agriculture, ecology, and economy of the state of Punjab. These alien invasives are known for their persistence, adaptability, competitive exclusion and reproductive capabilities. All of these unique characteristics have made these species establish successfully in this new ecological region outside their native ranges.