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Download Goutweed or Bishop`s weed, Aegopodium podagraria Species
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Goutweed or Bishop’s weed, Aegopodium podagraria Species Biology and Phenology: Habitat: Goutweed grows in abandoned fields, pastures, gardens, and open forests. It prefers full sun, but is highly shade tolerant, able to dominate forest understories, and does very well in light to moderate shade. Seedlings do best in disturbed soil in sunny locations, and flowers are fewer in dense shade. The leaves will die in conditions of intense heat or drought. This plant will tolerate a wide range of soil quality and pH. Reproductive Strategy: Goutweed is an aggressive perennial that reproduces primarily vegitatively through a rhizome system. Seeds require cold stratification to germinate, and the seed bank is short-lived. Seeds usually will germinate the next year after initial dispersal. New foliage appears in early spring and flowers bloom in June with small white umbels. The seeds turn brown when they ripen in late summer. Dispersal: Existing populations increase rapidly through the rhizome system. The plant will also spread through waterways. Humans are a major factor in long-range dispersal of goutweed; it is a popular garden plant and continues to be sold as an ornamental groundcover. Species Phenology and Treatment Options: Full leaf out Phenology Flowering Seed ripening Month Manual JAN FEB MAR APR MAY JUN JUL AUG Hand pulling and digging Cutting and mowing (at least once during growing season) Chemical Foliar herbicide SEPT OCT NOV DEC Treatment Methods: Category Method Method Description Manual treatment is not recommended for goutweed Post initial manual treatment, populations should be monitored for success and re-sprouting CHEMICAL MANUAL Hand Pulling Mowing/ Cutting • Pull entire plant by the base of the stem • Be sure to remove entire root system Considerations • Might be effective on small infestations if repeated annually for several year • Remaining portions of roots system not removed will re-sprout • Cutting/mowing may help slow the spread of goutweed but will not eradicate it • Use weed whacker/brush saw or mower to cut the stem as close to the ground as possible • Cut at least 1 times during growing season (mid April-mid October) • Repeat for 3-5 years Active ingredients commonly used in herbicides: Glyphosate or aminopyralid Foliar If foliar spraying only: Low Volume Backpack Sprayer Application • Foliar spray when plant is fully leafed out (May• Herbicides (active ingredient): glyphosate or triclopyr October) with surfactant • Spray leaf surfaces with low volume backpack • Used to target plants and minimize drift to desirable sprayer, or high volume mist blower species Low Volume Motorized Mist Sprayer • Herbicides (active ingredient): glyphosate or aminopyralid with surfactant Vermont Chapter of The Nature Conservancy 27 State Street Montpelier, VT 05602 www.vtinvasives.org