Biennial & Perennial Weeds
IRONWEED: TALL & WESTERN Vernonia gigantea and Vernonia baldwinii Life Cycle: Perennial Plant Description:
Clump-forming perennial herbs with erect stems 2 to 4 feet tall. Reproduce by rhizomes and seed. Long, lance- shaped leaves are sharply toothed with short hairs on lower surface. Reddish- purple flowers are arranged along slender branches at top of plant.
Treatment: Apply 16 fluid ounces of HighNoon ® herbicide per acre before flowering, during vegetative stage (starting when plants are about 10 inches in height) prior to bloom. Use higher rate in range when weeds are larger.
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