Annual Weeds
PIGWEED, SPINY AMARANTH Amaranthus spinosus Life Cycle: Annual Plant Description:
Stems erect, rough, textured. Grows to 6 feet tall. Leaves alternate and are dull green on long stems. Small green flowers are in dense spikes at stem tips and upper leaf axils. Each flower is surrounded by three shiny bracts. Seeds are small and shiny black. Smooth pigweed is similar but with shorter leaf stems and a smoother plant texture.
Treatment: Apply 16 fluid ounces of HighNoon ® herbicide per acre when all weeds emerge. Use 16 to 20 fluid ounces for mature plants.
Use lower rate when weeds are small and actively growing. Increase rate as season progresses and plants become more mature.
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