Side-by-side comparison of Palmer amaranth, waterhemp, and Redroot pigweed. Waterhemp and pigweed look similar at this stage.

Common waterhemp: An adaptable and potent foe

Problem weed continues to spread in Ontario while diversifying its herbicide resistance capability

Waterhemp with resistance to multiple herbicide groups continues to spread across the province, in part because of its similarity to other pigweed species.  First detected in Lambton County in 2002, […] Read more