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Redroot pigweed Pigweed Family Amaranthus retroflexus L. Key identifying traits Leaves have prominent veins and are lance shaped, sometimes turning a reddish color Plants grow 2-6’ in height Lower stems are normally red or red striped Flowers are small and green and flower clusters are full of stiff spike-like bracts Seeds are small, black and shiny Biology and ecology An annual plant reproducing by seed Redroot pigweed is a very prolific seed producer Germination can occur any time during the growing season when there is adequate soil moisture Due to the spiny bracts it is undesirable in hay crops This plant is a species native to tropical America and now widespread through the U.S. Pigweeds can be high in nitrates and toxic to livestock Control Prevention – Learn to identify plants; start monitoring early in the season Biological – No known biological control in our area Cultural – Planting a competitive grass or other cover crop Mechanical – Being an annual plant mowing or tillage will work good for control if done before plant flower and produce seed Chemical –There are many herbicides listed for control of pigweeds-products with dicamba such as “Weedmaster” are recommended. Also refer to the PNW Weed Management handbook for others. Where found – Scattered areas throughout Stevens County and seen quite frequently in abandoned crop fields and gardens All Photos Richard Old, XID Services, Inc. Stevens County Noxious Weed Control Board, January 2010