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Several pigweed species are found in the Great Plains. Pigweeds commonly reduce crop yields and interfere with harvest. One means of controlling these weeds is through the use of herbicides. Recent research indicates that some pigweed species respond differently to various herbicides; therefore, proper identification is needed for good control.
This extension contains a generalized distribution map; photographs of seeds, seedling, and mature plants; and text describing other identifying features for each pigweed species. The species are grouped with others that have similar shape and form. The pigweed species listed in this publication are: redroot pigweed, smooth pigweed, Powell amaranth, spiny amaranth, tumble pigweed, prostrate pigweed, common waterhemp, tall waterhemp, and Palmer amaranth.