Pigweed can mean any of a number of weedy plants which may be used as pig fodder:
- Amaranthus species
- Amaranthus albus, white pigweed, tumble pigweed
 - Amaranthus blitoides, prostrate pigweed
 - Amaranthus californicus, California pigweed
 - Amaranthus fimbriatus, fringed pigweed
 - Amaranthus hybridus, smooth pigweed
 - Amaranthus palmeri, the 'pigweed' resistant to glyphosate in the US Southeast
 - Amaranthus retroflexus, redroot pigweed
 
 - Chenopodium album white goosefoot
 - Polygonum aviculare
 - Portulaca species
 
See also
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