Giant Hogweed Comparison and Identification Sheet

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GIANT HOGWEED COMPARISON AND IDENTIFICATION SHEET Flowering Plant Name Leaf Shape Flower Stem and Height Flowers late June to mid July and can grow to be Between 7 and 14 feet tall (depending upon growth stage and if mowed or cut). Giant Hogweed Huge leaves, incised and deeply White flowers with 50-150 flower Green with purple splotches and lobed up to 5 feet across rays clustered into an umbrella coarse white hairs, thick circle of (Heracleum mantegazzianum) shaped flower cluster up to 2.5 feet hairs at base of leaf stalk, 2-4 across inches in diameter Flowers late May to late June and can grow up to 8 feet tall. Cow Parsnip Compound, less incised than White flat-topped flower clusters no Green and ridged with fine white (Heracleum maximum) hogweed, between 2 to 2.5 feet larger than 1 foot wide. 15 to 30 hairs, 1-2 inches in diameter wide rays per flower cluster, Flowers late May to early July and can grow up to 5 feet tall Wild Parsnip Compound, pinnate, 5 to 15 Single flower stalk with flat-topped Yellowish-green with full length toothed leaflets, variably lobed, umbel of yellow flower clusters grooves (no hairs or bristles) (Pastinaca sativa) yellowish-green Flowers in mid May to mid June and at maturity is 4 to 9 feet tall. Angelica Compound leaves that may extend Softball-sized and shaped clusters, Smooth, waxy purple, 1 to 2.5 up to 2 feet wide greenish-white or white inches in diameter (no hairs or (Angelica sp.) bristles) Flowers late May to late June, and at maturity is 4 to 9 feet tall. Poison Hemlock Bright green, small and fern-like, Small and white arranged in Smooth and waxy stem with purple may appear glossy numerous flat-topped clusters on all blotches, 1 to 2 inches in diameter (Conium maculatum) branches (no hairs or bristles) All information provided by New York State Department of Environmental Conservation: Giant Hogweed Identification page. Compiled by the University of Illinois Extension Forestry. Photos courtesy of Bugwood.org. Cow parsnip stem photo courtesy of Annalee Winter. Angelica photo credits to Maine Department of Agriculture, Conservation, and Forestry. .

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