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By: Ray Hanley

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Presentation on theme: "By: Ray Hanley"— Presentation transcript:

1 By: Ray Hanley

2  Native to central & southwest Asia  Found in open fields, along roadsides, along streams in natural areas, disturbed soils, and railroad embankments  Ornamental- showpiece ◦ Great Britain to U.S.  Favorite of bee keepers

3  Biennial or perennial herb in carrot family (Apiaceae)  Height – up to 20 feet  Hollow rigid stem – 2-4 inches in diameter ◦ Dark reddish purple blotches  Large compound leaves- up to 5 feet wide  White flower head up to 2.5 feet wide ◦ Blooms late June through August  Seeds- dry, flattened, and oval (3/8 inch long)

4 invader/ p_ten_0wanted0_list/html/4.stm

5 hogweed/

6 invasives/target-species/giant-hogweed/

7 hogweed/

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10  Range: ◦ Canada ◦ America ◦ Britain ◦ France ◦ Germany ◦ Belgium ◦ Asia

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16  Suppresses growth of native plants  No native predators  Impacts on wildlife- no food or habitat  Increased soil erosion ◦ Leaves barren soil in winter when dormant

17  Do Not Touch!  Brushing against ◦ Minor burns  Broken leaves or stems ◦ Clear watery sap-glucoside  Sap causes sensitivity to sunlight ◦ Skin contact-Severe slow to heal burns, scarring, blistering, painful sores, and purplish or blackened scars ◦ Eye contact- severe irritation or even blindness  If in contact- wash with soap and cold water ◦ Medical attention is advised nt_hogweed.htm

18  Very difficult to eradicate  Use caution in any type of removal  Physical Removal ◦ Mowing, cutting and use of line trimmers ◦ Biocontrol ◦ Digging out roots of plant ◦ Seed dispersal is an issue  Chemical Removal ◦ Pesticides- non selective

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20   invasives/target-species/giant-hogweed/ invasives/target-species/giant-hogweed/  toxic-invader/ toxic-invader/   ds/giant-hogweed.pdf ds/giant-hogweed.pdf


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