Pigweed and waterhemp identification table
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  Common Waterhemp Redroot Pigweed Smooth Pigweed Powell Amaranth Palmer Amaranth

Seedling shape

Stem hairs

Leaf shapes

Separate male and female plants Yes No No No Yes
Seedhead shape smooth, long, slender prickly, short, stout slightly prickly, long, slender prickly, very long, thick very prickly, very long, thick