A Quick Pigweed Identification Exercise

A scouting trip last Thursday to our Palmer amaranth research location west of Kankakee revealed that Palmer amaranth plants had begun to emerge a few days before our arrival. Early and accurate identification of Palmer amaranth plants is an important component of an integrated management program, but differentiating among seedling-stage Amaranthus plants sometimes can be difficult. As plants become larger and reproductive structures are present, identification becomes increasingly easier. The following photographs might help renew your Amaranthus species identification skills. See how many you can identify from these photographs, and in a few days we’ll repost this story with the species identified.

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Palmer amaranth

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Waterhemp

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Waterhemp

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Palmer amaranth

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Palmer amaranth

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Waterhemp

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Waterhemp

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Palmer amaranth

Cody's waterhemp populations

Waterhemp

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Redroot pigweed

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Smooth pigweed

Powell amaranth inflorescence

Powell amaranth

Spiny amaranth 4

Spiny amaranth

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Palmer amaranth