Pollen Type: Weed
Cross-Reactivity: Careless Weed, Western Waterhemp, Spiny Pigweed
HS Allergy Extract: Pigweed, Red-Root
Genus/Species: Amaranthus retroflexus L.
Common Names: Red-Root Pigweed, Red-Root Amaranth
Distribution: Throughout the United States.
Locations: Typically found in cultivated soil in gardens and orchards. It’s also found in wet fields, roadside ditches, and waste areas. Pigweed, its common name, was termed because it grows where hogs are pasture-fed. Suggested as a highly nutritious forage crop, it does contain nitrates and oxalates which may be toxic to cattle if eaten in large quantities.
Pollination Method: Wind-pollinated
Pollinating Period: Summer & Fall
Description: Redroot Pigweed is a 1’-10’ tall upright annual weed. It’s stout, rough, and finely haired with ascending branches from the base and dense green flower clusters at the end of its stems. Its egg shaped leaves grow on alternate sides. In warm southern areas there is a prolonged pollinating period (March-November), but the peak is still late summer.