This summer, we have gotten a few calls about Palmer amaranth and waterhemp, two pigweed species that unfortunately are becoming more common. These two pigweeds are difficult to control, mostly ...

Other species include spiny amaranth (A. spinosus), tumble pigweed (A. albus) and prostrate pigweed (A. graecizans). Redroot pigweed can reach 7 feet in height but more commonly grows 1 to 3 feet.

A new Saskatchewan study aims to prevent herbicide-resistant palmer amaranth and waterhemp from spreading, using cultural ...

It will be significantly longer, especially on older plants. If you take the petiole and leaf blade and fold them over, the petiole is longer on Palmer amaranth." The plant is hairless and has ...