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Redroot Pigweed (A) — Amaranthus retroflexus — Family: Amaranthaceae — Amaranth

© Copyright 2004-2014, Ronald Calhoun.
© Copyright 2004-2014, Ronald Calhoun.
© Copyright 2004-2014, Ronald Calhoun.
AKA

Redroot pigweed is a summer annual broadleaf weed that is typically associated with new establishments and other areas of disturbed soil (compost piles, gardens). Redroot pigweed is a prolific seeder and is associated with late summer allergies. The leaves of redroot pigweed are ovate (wider in the middle), shiny and very thin. The veins on the leaves are very prominent. Flowers form at the terminal and in axillary spikes. Pigweed will not usually persist in a mowed turf. However, it can establish in cool-season lawns during July and August when mowing frequency is reduced due to high temperatures and minimal soil moisture. Increased turf density and a little patience is the best remedy for redroot pigweed.