Weeds and Herbicide Application
Amaranthus is the genus for the pigweed family. The word is derived from the Greek word amarantus, which means “everlasting.” Most growers would agree that this is a very accurate description for the pigweeds. In Tennessee, over the last decade, pigweeds have become a major weed pest in row crops and pastures.
"W068 Pigweeds in Tennessee," The University of Tennessee Agricultural Extension Service, 05-0155 W068, http://trace.tennessee.edu/utk_agexcrop/102