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

Common names include (United States) tumble pigweed, tumbleweed; (Great Britain) pigweed amaranth, prostrate pigweed, white amaranth, and white pigweed.

Polioencephalomalacia in adult sheep grazing pastures with prostrate pigweed.

Common names include (United States) tumble pigweed, tumbleweed; (Great Britain) pigweed amaranth, prostrate pigweed, white amaranth, and white pigweed.

Although both its leaves and its seeds are edible, pigweed amaranth has not been cultivated as a food crop.

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

Common names include (United States) tumble pigweed, tumbleweed; (Great Britain) pigweed amaranth, prostrate pigweed, white amaranth, and white pigweed.

At the Mount Baker site, comprising 40 plots in southeast Seattle, longtime residents plant tomatoes, artichokes and raspberries alongside Laotian immigrants who grow fruits and vegetables from seeds they have brought from their homeland, like red and white amaranth, ghee (an herb with lime-green, heart-shaped leaves), Chinese spinach and garlic.

It is sometimes also called pigweed, although that name is often also used for Amaranthus albus.

Amaranthus albus (I)