Giant Hogweed

also called cartwheel-flower

Originally from Asia, giant hogweed has been introduced into Europe, Great Britain, Canada, and the United States. Although it is listed as a Federal noxious weed and is illegal to bring into the United States or move across State lines, giant hogweed is known to occur in New York, Ohio, Pennsylvania, and Washington. Reports of infestations have been received from Maine, Michigan, and Washington, DC.

This weed has been planted as an ornamental in the United States and may have also been brought into this country for its fruit, used as a spice (golmar) in Iranian cooking.

As its name indicates it can grow to 15' — 20' high. Except for size, it closely resembles cow parsnip, Heracleum lanatum, a plant native to Washington. Giant hogweed flower

It is further distinguished by a stout dark, reddish-purple stem and spotted leaf stalks. The stem and stalks are hollow, stems vary from 2" — 4" in diameter. The compound leaves of giant hogweed may quickly grow to 5' wide. Each leaflet is deeply incised. Split open hogweed seed pod

Giant hogweed is a perennial with tuberous root stalks which form perennating buds each year and produces large elliptic dry fruits marked with brown swollen resin canals up to 1 mm in diameter.

Hogweed is a public health hazard

Hogweed's clear, watery sap has toxins that cause photo-dermatitis. Skin contact followed by exposure to sunlight produces painful, burning blisters that may develop into purplish or blackened scars that can can last for several years.


Expand All \| Collapse All Problems Lawn & Landscape Problems Animal Problems Diseases Insects Insect Controls Soil Problems Weeds Weeds Weed ID Photo ID Poor Soils Lawn Moss Mushrooms Sandbur Speedwell Spurge Edible Weeds Grassy Weeds Grassy Weeds Annual Bluegrass Barnyardgrass Bentgrass Bermudagrass Crabgrass Dallisgrass Fall Panicum Foxtails Goosegrass Johnsongrass Nimblewill Quackgrass Grass-like Weeds Grass-like Wild Garlic/Onion Star of Bethlehem Yellow Nutsedge Broadleaf Weeds Broadleafs Buckhorn Plantain Carolina Geranium Carpetweed Chickweed Beggarweed Curly Dock Dandelions Henbit Horsenettle Ground Ivy Lambsquarters Plantain Ragweed White Clover Wild Violets Wood Sorrel Weed Controls Control Types Pre-emergent Post-emergent Biological Controls Chemical Controls Mechanical Controls Spot Controls Cultural Controls Organic Controls IPM Botanical Names Noxious Weeds Noxious Canadian Thistle Hogweed Horsenettle Poison Ivy Poison Ivy Exposure Poison Oak Poison Sumac Quackgrass Enter your ZipCode below to find a professional in your area. Subscribe to our Newsfeed:	Home Landscapes Gardens Lawns Problems Lawn & Landscape Problems Animals Diseases Insects Insect Controls Soils Weeds Common Weeds Grass-like Weeds Grassy-type Weeds Broadleaf Weeds Annual Bluegrass Barnyardgrass Bentgrass Bermudagrass Star of Bethlehem Buckhorn Plantain Carpetweed Chickweed White Clover Crabgrass Creeping Beggarweed Dallisgrass Dandelions Curly Dock Foxtails Wild Garlic Carolina Geranium Goosegrass Henbit Horsenettle Ground Ivy Johnsongrass Lambsquarters Moss Mushrooms Nimblewill Nutsedge Panicum Plantain Quackgrass Ragweed Sandbur Soil Problems Speedwell Spurge Wild Violets Woodsorrel Edible Weeds Weed Identification Identification Photo Id Weed Controls Controls Pre Emergent Post Emergent Spot Controls Chemical Controls Mechanical Controls Biological Controls Cultural Controls IPM Corngluten Botanical Names Noxious Weeds Canadian Thistle Hogweed Horsenettle Poison Ivy Poison Ivy Rash Poison Oak Poison Sumac Quackgrass Soil Problems Galleries Resources Forum
	>>Home > Giant Hogweed also called cartwheel-flower Originally from Asia, giant hogweed has been introduced into Europe, Great Britain, Canada, and the United States. Although it is listed as a Federal noxious weed and is illegal to bring into the United States or move across State lines, giant hogweed is known to occur in New York, Ohio, Pennsylvania, and Washington. Reports of infestations have been received from Maine, Michigan, and Washington, DC. This weed has been planted as an ornamental in the United States and may have also been brought into this country for its fruit, used as a spice (golmar) in Iranian cooking. As its name indicates it can grow to 15' — 20' high. Except for size, it closely resembles cow parsnip, Heracleum lanatum, a plant native to Washington. It is further distinguished by a stout dark, reddish-purple stem and spotted leaf stalks. The stem and stalks are hollow, stems vary from 2" — 4" in diameter. The compound leaves of giant hogweed may quickly grow to 5' wide. Each leaflet is deeply incised. Giant hogweed is a perennial with tuberous root stalks which form perennating buds each year and produces large elliptic dry fruits marked with brown swollen resin canals up to 1 mm in diameter. Hogweed is a public health hazard Hogweed's clear, watery sap has toxins that cause photo-dermatitis. Skin contact followed by exposure to sunlight produces painful, burning blisters that may develop into purplish or blackened scars that can can last for several years. Read more: InvasiveSpecies.org

	©2005 - 2007 Landscape-America.com. All Rights Reserved Site Map \| Pro Search Submission Form \| American-Lawns.com \| FAQ \| Resources Site Submission \| Article Submissions RECOMMEND US TO YOUR FRIENDS

Identifying and solving problem weeds

Enter your ZipCode below to find a professional in your area.

Giant Hogweed

also called cartwheel-flower

Hogweed is a public health hazard