Botanical name of carrot grass is Parthenium hysterophorus. Carrot grass belongs to Family Asteraceae and is native to sub tropics of North and South America. It
is a fast maturing annual (under certain conditions, a short lived perennial) with a deep tap root and an erect stem that becomes woody with age. It is considered a highly invasive weed. Its large and persistent soil seed bank, fast germination rate and ability to undergo dormancy make it well adapted to semi-arid environments. It also releases chemicals that inhibit the germination and growth of pasture grasses and other plants. Lantana is a genus of perennial flowering plants of Verbenaceae Family. The genus includes both herbaceous plants and shrubs. Their common names are shrub verbenas or lantanas. Some species are invasive and considered to be noxious weeds.