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James A. Gagliardi and Mark H. Brand

Invasive species pose the second greatest threat to natural ecosystems and are surpassed only by habitat destruction as a threat to global biodiversity ( Bir, 2000 ; Morin, 1999 ; Wilcove et al., 1998 ). Nonnative plants that establish self

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Chengyan Yue, Terry Hurley, and Neil O. Anderson

Invasive plant dispersals have been strongly affected by the trade and distribution of horticultural plants, primarily by ornamental plants ( Anderson and Ascher, 1993 ; Groves, 1998 ; Mack, 2003 ; Mack and Erneberg, 2002 ; Randall and Marinelli

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Carl E. Bell, Cheryl A. Wilen, and Alison E. Stanton

1 Regional Advisor-Invasive Plants. 2 Area Integrated Pest Management Advisor, Univ. of California Statewide IPM Program. 3 Former Graduate Student. This material is based upon work supported by the Cooperative State Research, Education and

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Lyn A. Gettys

Non-native invasive species pose a significant threat to aquatic ecosystems and can disrupt the use of invaded systems. For example, alien plants often outcompete indigenous flora and form monocultures that cannot be used by native fauna, which

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Clara E. Trueblood, Thomas G. Ranney, Nathan P. Lynch, Joseph C. Neal, and Richard T. Olsen

naturalized outside of its native range into Australia, New Zealand, and Chile ( Robson, 1985 ). Hypericum androsaemum is considered an invasive species in Australia and New Zealand where it has formed dense thickets and displaced native plants ( Weber, 2003

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Melissa Bravo, Antonio DiTommaso, and David Hayes

was planted. Method and materials Study site. An exotic plant inventory of the cultural landscape plantings followed by an exotic plant survey of all areas of the estates and an invasive exotic plant assessment of the natural resource areas were

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Kelly J. Vining, Ryan N. Contreras, Martin Ranik, and Steven H. Strauss

industry and are known to be a major source of spread ( Dehnen-Schmutz, 2011 ). However, most exotic plants do not spread significantly beyond the area of cultivation nor become problematic or invasive. The “Rule of Tens” proposed by Williamson and Fitter

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Kathleen M. Kelley, Janine R. Stumpf, James C. Sellmer, and Ricky M. Bates

Consumers were surveyed at the 2004 Philadelphia Flower Show in Philadelphia, Pa. from 8–10 Mar., to quantify their attitudes and behaviors towards invasive plant species and the potential problems associated with purchasing and planting invasives in the landscape. A majority of the 341 participants (81.5%) was aware that non-native exotic plants were used in the landscape and that these plants may be invasive in natural areas. Less than half (40.1%) acknowledged owning plants that were considered invasive, while one-third (33.5%) did not know. Less than half (41.3%) believed that laws should be passed to prevent sale of non-native exotic plants, while 27.8% believed that laws should be passed to allow sale of only native plants in their area. Three distinct consumer segments were identified using cluster analysis: “Invasive savvy,” participants knowledgeable about invasives and interested in alternative species; “Invasive neutral,” participants neutral in their decision to purchasing alternatives to invasive plants and price sensitive in regard to paying more for plants tested for invasiveness; and “Invasive inactive,” participants opposed to purchasing genetically modified plants or those bred to be seedless. Survey results indicated that media sources (e.g., television and newspapers/magazines/books) would be effective for educating consumers about potential problems associated with invasive species in the landscape.

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Pragati Shrestha and Jessica D. Lubell

The sustainable landscape featuring native plants is a rapidly expanding trend in horticulture. Native plants support wildlife, including pollinators, and are not invasive ( Tallamy, 2007 ). Some of the most popular and widely used plants for

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Sharon Frey and Carolyn Robinson

Plants have been introduced into the United States intentionally as well as unintentionally as seeds and weeds. Technological advances, a mobile society, and our curiosity and desire to improve our landscapes have led to an ever-increasing invasive movement. These alien plants can jeopardize native populations, alter ecosystems, alter fire and water regimes, change the nutrient status, modify habitats, and cause significant economic harm. Today's public is unaware of the danger some non-native plants species pose to natural areas, thereby contributing to the lack of control for non-native invasive plants. This study looked at the knowledge and attitudes of Texas Master Gardeners as related to invasive species commonly used in landscaping. A web survey was made available to all Texas Master Gardeners that included pictures of plants along with their common and scientific names. Participants were asked to identify which they thought were invasive and contribute information regarding their knowledge of non-native invasive plants. Each of the invasive plants shown is on both the federal and the Texas Invasive Plant lists. Inquires were made concerning the occurrence of these plants in the participants' personal landscape and communities and their perceptions of each plant as an invasive threat. The purpose of the study is to determine if a relationship exists between knowledge, attitudes and perceptions of the participant and the occurrence of non-native invasive plants in the landscape. The results of this study will help determine factors that contribute to the lack of control for non-native invasive plants.