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Kendall County (IL) Forest Preserve District Slender Pigweed (Green Amaranth) This non-native Slender Pigweed is very common in our area. This weed typically occurs in full sun in slightly moist loamy soil with high nitrogen content. It prefers highly disturbed and degraded habitats including farm lots and waste areas. It is a summer annuall 2-6' tall, usually unbranched. The alternate smooth oval-shaped leaves are up to 5½" long and 3" across with long petioles. The upper stem terminates in an elongated panicle of spikes (up to 2' long) with small green flowers.
Slender Pigweed at Yorkville Riverview Park August 24, 2015
Slender Pigweed at Yorkville Riverview Park August 30, 2015 (blooms advancing to utricles) Each Slender Pigweed individual flower is later replaced by a seed in a bladder-like membrane (utricle) which becomes reddish tan and splits apart to release the seed.
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