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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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James A. Gagliardi and Mark H. Brand

., 1996 ). These impacts, coupled with the economic costs of management and control ( Pimentel et al., 2000 ), emphasize the importance of developing successful solutions to the invasive plant issue. Many plants of horticultural interest are found on the

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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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S. Christopher Marble and Stephen H. Brown

The ecological and economic impacts of invasive plants are well documented and were thoroughly synthesized previously ( Kettenring and Adams, 2011 ; Pysek et al., 2012 ; Weidlich et al., 2020 ). From an ecological standpoint, invasive plants

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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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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.

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Michael A. Schnelle and Lyn A. Gettys

environmental stewardship, by reducing weedy to invasive plant spread, behooves all involved. The ornamentals industry is a key source of nonnative species escaping from cultivation ( Lehan et al., 2013 ; Pysek et al., 2011 ; Reichard and White, 2001 ; van

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S. Christopher Marble

An invasive species is defined as “an alien (non-native) species whose introduction does or is likely to cause economic or environmental harm or harm to human health” ( USDA, 2018a ). Invasive plants have been subject to significant research from

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Lyn A. Gettys and Michael A. Schnelle

Invasive Plants Research Interest Group of the American Society for Horticultural Science (ASHS) developed and hosted workshops at the 2017 and 2018 ASHS annual conferences to explore this phenomenon. The objective of the 2017 workshop, titled “Strategies

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Pragati Shrestha and Jessica D. Lubell

landscape sites. Furthermore, high white-tailed deer pressure on many landscapes necessitates the need for white-tailed deer-resistant ornamental plants. The replacement of invasive plants with native plants is a desirable solution to the invasive plant