Annual Weeds
MARSHELDER or SUMPWEED, SULPHURWEED Iva annua Life Cycle: Annual Plant Description: Robust, branching stems with greenish- white flowers at the top grow 2 to 10 feet tall. Leaves grow opposite one another with long petioles. Flowers are stalkless and crowded on long, branching spikes at the tops of stems with rough (sandpaper) texture. Treatment: 16 fluid ounces of DuraCor ® herbicide
per acre on plants less than 4 inches tall. Taller, more mature plants require 20 fluid ounces of DuraCor herbicide per acre with 1% MSO per volume of water used. Once the plant branches, do not treat.
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