The giant amaranth is a very unusual plant that is native to the southern United States. It is an herbaceous annual or a short-lived perennial but it grows to the size of a small tree. It has a massive, trunk-like stem that is enlarged at the base and stout, spreading branches. The whole plant resembles a bald cypress tree with its pyramidal form and enlarged base. In one season it can grow over 20 feet tall and with a thick stem. It grows in fields and wetlands. The seeds are edible.

 

Appearance: The plant typically grows as an erect annual herb, reaching heights of 1 to 2 meters (3 to 6 feet). The leaves are alternate, lance-shaped, and can vary in size.

Flowers: Amaranthus australis produces dense, erect spikes of tiny, greenish flowers. The flowers are often inconspicuous and are arranged in terminal panicles.

Seeds: Like many species in the Amaranthus genus, Amaranthus australis produces small seeds that are often shiny black. The seeds are a characteristic feature and can be used for identification.

Habitat: This plant is adaptable to various environmental conditions and can be found in both moist and dry habitats. It is often considered a weed in agricultural settings.

Cultural Uses: Some species of amaranth, though I can't confirm specifically for Amaranthus australis, have been historically cultivated for their edible leaves and seeds. Amaranth leaves are nutritious and can be used in salads or cooked as a leafy green vegetable. The seeds of certain amaranth species are also edible and have been used as a grain.