Pigweed can mean any of a number of weedy plants which may be used as pig fodder: * ''

Amaranthus ''Amaranthus'' is a cosmopolitan genus of annual or short-lived perennial plants collectively known as amaranths. Some amaranth species are cultivated as leaf vegetables, pseudocereals, and ornamental plants. Catkin-like cymes of densely pac ...

'' species ** '' Amaranthus albus'', white pigweed, tumble pigweed ** ''

Amaranthus blitoides ''Amaranthus blitoides'', commonly called mat amaranth, prostrate pigweed, procumbent pigweed, prostrate amaranth, or matweed, is a glabrous annual plants species. It usually grows up to 0.6 m, though it may grow up to 1 m (3 feet). It flowers ...

'', prostrate pigweed ** ''

Amaranthus californicus ''Amaranthus californicus'' is a species of flowering plant in the amaranth family known as California amaranth. It is a glabrous monoecious annual that is native to most of the western United States and Canada Canada is a country in ...

'', California pigweed ** ''

Amaranthus fimbriatus ''Amaranthus fimbriatus'' is a species of glabrous flowering plant in the Amaranthaceae family. It is commonly known as fringed amaranth or fringed pigweed. The plant is an annual herb that can often grow up to 0.7 m (2 ft.) in height. ...

'', fringed pigweed ** ''

Amaranthus hybridus ''Amaranthus hybridus'', commonly called green amaranth, slim amaranth, smooth amaranth, smooth pigweed, or red amaranth, is a species of annual flowering plant. It is a weedy species found now over much of North America and introduced into Europ ...

'', smooth pigweed ** '' Amaranthus palmeri'', the 'pigweed' resistant to

glyphosate Glyphosate (IUPAC name: ''N''-(phosphonomethyl)glycine) is a broad-spectrum Herbicide, systemic herbicide and Crop desiccation, crop desiccant. It is an organophosphorus compound, specifically a phosphonate, which acts by inhibiting the plan ...

in the US Southeast ** ''

Amaranthus retroflexus ''Amaranthus retroflexus'' is a species of flowering plant in the family Amaranthaceae with several common names, including red-root amaranth, redroot pigweed, red-rooted pigweed, common amaranth, pigweed amaranth, and common tumbleweed. page 4 ...

'', redroot pigweed * ''

Chenopodium album ''Chenopodium album'' is a fast-growing weedy annual plant in the genus ''Chenopodium''. Though cultivated in some regions, the plant is elsewhere considered a weed. Common names include lamb's quarters, melde, goosefoot, wild spinach and fat-h ...

'' white goosefoot * ''

Polygonum aviculare ''Polygonum aviculare'' or common knotgrass is a plant related to buckwheat and dock. It is also called prostrate knotweed, birdweed, pigweed and lowgrass. It is an annual found in fields and wasteland, with white flowers from June to October. I ...

'' * ''

Portulaca ''Portulaca'' (, is the type genus of the flowering plant family Portulacaceae, with over 100 species, found in the tropics and warm temperate regions. They are known as the purslanes. Common purslane (''Portulaca oleracea'') is widely consume ...

'' species

See also