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Peter Alem, Paul A. Thomas, and Marc W. van Iersel

nonchemical methods of height control have been described. Previous work has shown the possibility of controlling plant height by reducing temperature or by manipulating night and daytime temperatures ( Berghage and Heins, 1991 ; Moe et al., 1992a ). However

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Judy Lee, Miguel I. Gómez, and William B. Miller

regulate plant height and improve plant uniformity and can contribute to more accurate scheduling of flowering dates, meeting market requirements for plant height, and reduction of shipping costs. Although there are general guidelines suggesting the best

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Peter Alem, Paul A. Thomas, and Marc W. van Iersel

Poinsettia height control involves careful application of height regulation without compromising plant quality. The use of PGRs is a standard practice in poinsettia height regulation. However, excessive application of PGRs can result in permanent

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Barbara A. Fair, Brian Whipker,, Ingram McCall, and Wayne Buhler

butterflies. Hybrid sage was selected for this study based on its popularity in southern gardens and to determine if a plant growth regulator (PGR) could help control stem height, potentially increasing ease of shipping and handling. In previous work ( Latimer

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Mengzi Zhang, Jie Yang, Huitang Pan, and Brian J. Pearson

develop long flower peduncles that can result in lodging and decreased commercial marketability. Therefore, controlling the height of baby primrose in greenhouse environments is critical to its potential commercial success. Plant growth regulators (PGRs

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Silvia R. Marino, Jeffrey G. Williamson, James W. Olmstead, and Philip F. Harmon

harvest season (before destructive sampling on June 2011), only removing the old flower spikes while the new vegetative flush was allowed to grow. Vegetative field measurements. In 2010 and 2011, from July to November, average plant height and width in

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Christopher J. Currey and Roberto G. Lopez

Poinsettia is an important flowering potted crop in the United States with a wholesale value of over $153 million ( U.S. Department of Agriculture, 2009 ). Poinsettia height can exceed the requirements for commercially acceptable finished plants

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Brian A. Krug, Brian E. Whipker, and Ingram McCall

Caladiums can be excessively large relative to the container in which they are grown, and plant growth regulators (PGRs) are required for height control. No industry standard has been set for optimal height of caladiums, but plants 25 to 28 cm tall

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Josh B. Henry, Ingram McCall, and Brian E. Whipker

limit plant height and promote overall compactness. Growers typically manage excessive stem elongation with chemical growth regulators such as PGRs ( Whipker, 2017 ). A concern associated with PGRs is that they are not labeled for all crops. PGRs also

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Sonali R. Padhye and Judith K. Groninger

during greenhouse or nursery production, hence suppressing plant height is necessary. Controlling the height of ornamental grasses has multiple benefits, including avoiding container lodging, maintaining height proportional to the container to improve