University of Missouri Extension

IPM1007, Revised November 2009

Practical Weed Science for the Field Scout: Corn and Soybean

Waterhemp, common (Amaranthus rudis)

Summer annual broadleaf

Waterhemp Waterhemp

Waterhemp A summer annual pigweed of agricultural crops. Seedlings have egg-shaped cotyledons, much more so than other pigweeds. First true leaves are lance shaped, without hairs, and have a glossy appearance. Mature plants range from 4 inches to 12 feet in height and have long and narrow leaves (lance-shaped) that are also waxy or glossy in appearance. Waterhemp stems are also hairless, similar to palmer amaranth but unlike redroot and smooth pigweed and Powell amaranth. Seedheads of male waterhemp are generally more compact than female waterhemp seedheads, which have a more open habit.
 

Waterhemp

IPM1007, revised November 2009

Wild thing
 

IPM1007 Practical Weed Science for the Field Scout: Corn and Soybean | University of Missouri Extension

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