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Robyn L. Cave, Colin J. Birch, Graeme L. Hammer, John E. Erwin and Margaret E. Johnston

Seed germination of Brunonia australis Sm. ex R.Br. and Calandrinia sp. (Mt. Clere: not yet fully classified) was investigated using a thermogradient plate set at different constant temperatures to determine seed propagation requirements of these potential floriculture species. Germination responses were tested at 3, 7, 11, 15, 18, 22, 25, 29, 34, and 38 °C. Germination data were modeled using the cumulative distribution function of the inverse normal, which provides information on lag, rate, and maximum seed germination for each temperature regime. To determine cardinal temperatures, the reciprocal time to median germination (1/t 50) and percentage germination per day were calculated and regressed against temperature. Base temperature estimates for B. australis were 4.9 and 5.5 °C and optimum temperatures were 21.4 and 21.9 °C, whereas maximum temperatures were 35.9 and 103.5 °C, with the latter being clearly overestimated using the 1/t 50 index. Base temperatures for Calandrinia sp. were 5.8 and 7.9 °C, whereas optimum and maximum temperature estimates of 22.5 and 42.7 °C, respectively, were reported using the percentage germination per day index. Maximum seed germination of 0.8 to 0.9, expressed as the probability of a seed germinating, occurred at 11 to 25 °C for B. australis, whereas maximum germination for Calandrinia sp. was 0.5 to 0.7 at 18 to 25 °C. Thermal time, the accumulation of daily mean temperate above a base temperature, was calculated for different germination percentages. Estimates of thermal time (°Cd) for 50% seed germination were 54 and 90 °Cd for B. australis and Calandrinia sp., respectively.

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Nicole L. Waterland, Craig A. Campbell, John J. Finer and Michelle L. Jones

Floriculture crops represent a $4.2 billion industry in the United States with bedding plants accounting for ≈44% of their total wholesale value ( USDA, 2009 ). In the last 17 years, there has been a change in the retailing of floriculture crops

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Christopher J. Currey and Roberto G. Lopez

floriculture crop growth and development ( Boodley, 1996 ; Dole and Wilkins, 2005 ). Therefore, greenhouse crop production instruction must draw from a wide range of scientific concepts. Applying this broad body of knowledge to successfully solve problems and

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Chad T. Miller and Mark P. Bridgen

diversity in the floriculture industry. The objective of this study was to evaluate the dormancy characteristics of five recently developed achimenes cultivars and its effect on the subsequent number of weeks to root and shoot emergence. Materials and

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Joyce L. Merritt, Ellen Dickstein, Robert S. Johnson, Michael Ward, Robert J. Balaam, Carrie L. Harmon, Philip F. Harmon, G. Shad Ali, Aaron J. Palmateer, Timothy Schubert and Ariena H.C. van Bruggen

Statistics Service (NASS), in 2007, there were ≈18,670 greenhouse operations with floriculture crops in the United States with 820 million square feet in production. The total sale value of floricultural crops was $6.5 billion in 2007 ( USDA-NASS, 2007a ). In

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Jonathan M. Frantz and Peter Ling

The top 15 states that the USDA tracks for floriculture production had a wholesale value of $4.2 billion with bedding plants representing approximately one-third of this industry ( U.S. Dept. Agr., Nat. Agr. Stat. Ser., 2009 ). Petunia wholesale

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Nicholas J. Flax, Christopher J. Currey, James A. Schrader, David Grewell and William R. Graves

Annual bedding and garden plants made up 44% ($2.56 billion) of all floriculture sales in 2014 ($5.87 billion) [U.S. Department of Agriculture (USDA), 2015]. Nearly 600 million containerized plants, not including flats and hanging baskets, accounted

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Christopher J. Currey and Nicholas J. Flax

floriculture crops. OFA Serv., Columbus, OH Callesen, O. Adriansen, E. 1983 Development of rhizome-like shoots in Gloxinia sylvatica (HBK) Wiehler treated with ethephon Sci. Hort. 21 85 92 Cavins, T.J. Whipker, B.E. Fonteno, W.C. Harden, B. McCall, I. Gibson

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Medani Omer, James C. Locke and Jonathan M. Frantz

nearly 200 μmol·m −2 ·s −1 ( Evans and Farquhar, 1991 ; Wheeler et al., 1993 ) and well below minimum growth guidelines for floriculture crops ( Fisher and Both, 2004 ). This production environment was not considered to be representative of what is

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

) investigated low P fertility as an alternative to PGRs using 0.3–31 ppm P with several floriculture species, including argyranthemum ( Argyranthemum frutescens ), aster ( Aster novi-belgii ), pentas ( Pentas lanceolate ), and hybrid rose ( Rosa × hybrid ). For