Colocasia esculenta
(L.) Schott (Elephant ears ) |
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Family: Araceae (Arum Family) Synonym(s): Colocasia antiquorum Duration: Perennial Habit: Herb
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Description: Perennial herb to 1.5 m (4 ft) tall, with thick shoots from a large corm; slender stolons also often produced, along with offshoot corms. Leaf blades to 60 cm (24 in) long and 50 cm (20 in) wide, arrowhead shaped, with upper surface dark green and waxy; leaves peltate (stalked from back of blade); petioles large, succulent, often purplish near top. Petiole attached to leaf several inches from V-shaped notch; the petiole of a similar non-native species that can be come invasive, Arrow-Leaved Elephant Ear (Xanthosoma sagittifolium) attaches directly to the base at the notch. Inflorescence on a fleshy stalk shorter than leaf petioles; part of fleshy stalk enveloped by a long yellow bract (spathe); flowering is rare. Flowers tiny, densely crowded on upper part of fleshy stalk, with female flowers below and male flowers above. Fruit a small berry, in clusters on the fleshy stalk. History: Introduced to the United States in 1910 as a substitute crop for potatoes, and later cultivated as an ornamental. Numerous varieties continue to be sold in the nursery trade, despite its invasiveness, due to the economic importance of the species. Biology & Spread: Reproduces primarily vegetatively, via culm fragmentation and budding at the base of the plant. Disturbance greatly encourages growth and facilitates its spread. Plantings alongside water bodies are a primary pathway that can result in spread. Ecological Threat: Taro invades wetland areas and colonizes river, stream and lake banks, forming dense growth. Outcompetes native species, thus altering natural habitat and ecosystem processes; reduces biodiversity.It will forms dense stands along lakes and rivers where it can completely eliminate native plant species in infested areas. US Habitat: Needs soil that is moist to wet, mildly acidic, and rich in organic material. Found spreading along wetland fringes as well as stream, ditch, canal, and lake banks. Distribution
Resembles/Alternatives: Native alternatives include Jack in the pulpit (Arisaema triphyllum), Buttonbush (Cephalanthus occidentalis) and Pickerelweed (Pontederia cordata). It resembles Arrow-leaved elephant ear (Xanthosoma sagittifolium). Management: Herbicides with the following active ingredients have been successful in treating elephant ears (E = excellent control, G = good): triclopyr (G), glyphosate(not rated), imazapyr (E), and imazamox (E). In mechanical removal, all care must be taken to keep the plant intact, as remaining fragments will readily germinate. USE PESTICIDES WISELY: ALWAYS READ THE ENTIRE PESTICIDE LABEL CAREFULLY, FOLLOW ALL MIXING AND APPLICATION INSTRUCTIONS AND WEAR ALL RECOMMENDED PERSONAL PROTECTIVE GEAR AND CLOTHING. CONTACT YOUR STATE DEPARTMENT OF AGRICULTURE FOR ANY ADDITIONAL PESTICIDE USE REQUIREMENTS, RESTRICTIONS OR RECOMMENDATIONS. MENTION OF PESTICIDE PRODUCTS ON THIS WEB SITE DOES NOT CONSTITUTE ENDORSEMENT OF ANY MATERIAL. Listing Source
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Last Updated: 2020-11-06 by LBJWFC |
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