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Margrethe Serek, Edward C. Sisler and Michael S. Reid

A 6-hour fumigation of flowering Begonia ×elatior hybrida Fotsch. `Najada' and `Rosa', B. ×tuberhybrida Voss. `Non-Stop', Kalanchoe blossfeldiana Poelln. `Tropicana', and Rosa hybrida L. `Victory Parade' plants with 1-MCP, (formerly designated as SIS-X), a gaseous nonreversible ethylene binding inhibitor, strongly inhibited exogenous ethylene effects such as bud and flower drop, leaf abscission, and accelerated flower senescence. The inhibitory effects of 1-MCP increased linearly with concentration, and at 20 nl·liter-1 this compound gave equal protection to that afforded by spraying the plants with a 0.5 STS mm solution. Chemical names used: 1-methylcyclopropene (1-MCP), silver thiosulfate (STS).

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Kaylee A. South, Paul A. Thomas, Marc W. van Iersel, Cindy Young and Michelle L. Jones

Orchids are currently the top-selling potted flowering plant in the United States because of their long flower life and compact growth ( Banks, 2005 ; Fitch, 2004 ; USDA, 2016 ). While the popularity of many potted plants is declining, the number

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Benjamin L. Campbell and Charles R. Hall

and vegetables, fruits, and herbs), foliage, and potted flowering plants. Summary statistics of total gross sales and gross plant category sales can be found in Table 1 . As expected, although not all firms sold every type of plant category, some

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Terril A. Nell, Ria T. Leonard, A.A. De Hertogh and James E. Barrett

Potted Lilium Asiatic hybrids `Aristocrat', `Horizon', and `Polka' were evaluated following 3, 6, or 9 days of transport at 2, 7, or 13C. `Aristocrat' and `Horizon' withstood transport with little or no effect on floral bud opening. `Polka' was the most sensitive cultivar to transport, where bud opening decreased 33% when transported at 13C for 9 days. Most floral buds opened on `Aristocrat' (90% to 98%), while fewer buds opened on `Horizon' (37% to 56%) and `Polka' (52% to 90%). Individual flower longevity and diameters were largely unaffected by transport. Plant longevity was reduced 4 to 7 days when transported for 9 days at ≥7C or for >3 days at 13C. Plant longevity averaged 16 days for `Aristocrat' and `Polka' and 12 days for `Horizon'. `Aristocrat' and the Oriental potted hybrid lily `Star Gazer' were maintained at postproduction conditions of 18, 21, or 24C at 7 or 14 μmol·m–2·s–1 after being commercially transported for 4 days at 5 ± 2C. Postproduction conditions had no effect on floral bud opening of `Aristocrat' (98% to 99%), while bud opening of `Star Gazer' was reduced 17% at 24C compared to 18C. Plants lasted 4 and 9 days longer at 18C than at 21 or 24C, respectively. Foliar discoloration was greatest at 24C. Irradiance level had no effect on the variables evaluated.

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Yin-Tung Wang

An experiment was initiated to determine the effect of a low N, high P and K fertilizer applied during the flowering season on a hybrid moth orchid (Phalaenopsis TAM Butterfly Blume.). On 1 Sept., plants of flowering size receiving N, P, and K at 100, 44, and 83 mg·L–1, respectively, from a 20N–8.8P–16.6K soluble fertilizer were given N, P, and K, at 30, 398, and 506 mg·L–1 (high P), respectively, at each or every fourth irrigation. Control plants continued to receive the 20N–8.8P–16.6K fertilizer. The high P treatments, regardless of the frequency of application, had no effect on the date of emergence of the flowering stem (spiking), anthesis, or flower size. All plants treated with the high P fertilizer had fewer flowers (15 to 19) than the controls (24 flowers). Continuous application of adequate N appears to be more important than low N and increased P for optimal flowering. In a separate experiment using the same hybrid orchid, terminating fertilization completely on 1 Sept., 29 Sept., or 27 Oct. or when the flowering stems were emerging (1 Oct.) reduced flower count (≤19 vs. 24). Flower longevity was reduced by 12 d when fertilization was terminated on 1 Sept. Flower size was unaffected by any treatment in either experiment. Discontinuing fertilization prior to late November reduced flower count. Withholding fertilization for extended periods resulted in red leaves, loss of the lower leaves, and limited production of new leaves.

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Matthew G. Blanchard and Erik S. Runkle

Orchids are the second most valuable potted flowering plant in the United States with a reported wholesale value of $123 million in 2006, an increase of 162% in the past decade ( U.S. Department of Agriculture, 2007 ). In 2006, 14.7 million potted

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David C. Zlesak and Neil O. Anderson

Flowering, potted Easter lilies ranked among the top five potted flowering plants for economic value in the United States in 2004, with more than 9.3 million pots produced and a wholesale value of about $38.5 million ( U.S. Department of

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John M. Dole and Michael A. Schnelle

Oklahoma floriculture producers, ornamental-horticulture retailers, mass-market retailers, and cut-flower wholesalers were surveyed to compare and contrast the industry in terms of attitudes towards their products and problems. Overall, attitudes of all four segments of the industry were neutral to negative on potted flowering plants, but were positive to neutral on bedding and foliage plants. However, producers were slightly negative concerning the postharvest life of bedding plants. While cut-flower wholesalers had a positive attitude concerning cut flowers, ornamental-horticulture retailers and mass-marketers tended to be neutral to negative. In particular, retailers and mass-marketers believed that cut flowers were too expensive and too short-lived. Floral preservatives were used by 82% of ornamental-horticulture retailers, while only 19% of mass-market retailers used preservatives. All cut-flower wholesalers used preservatives. Capital availability and market demand were the factors most limiting expansion for producers and ornamental-horticulture retailers; whereas mass-market firms listed competition as their most limiting factor.

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Thea M Edwards, Terril A. Nell and James E. Barrett

Increased rates of senescence and ethylene related damage of potted flowering plants have been observed in supermarket produce areas where flowers and climacteric produce are displayed together. Ethylene levels in produce areas were found to average 20 ppb. An open system of clear glass chambers with fiberglass lids was designed to simulate retail supermarket conditions. The chambers were kept in postharvest rooms where light level and temperature could be controlled. In a 3 by 3 by 3 Box-Behnken design, Sunblaze `Candy' miniature potted roses were exposed to three levels of ethylene, 20, 40, and 80 ppb, for 1, 2, and 4 days. The three light levels used were: 0, 7, and 14 μmol·m-2·s-1. Ethylene damage was based on leaf and bud drop and decreased flower longevity.

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Gwendolyn Hartley and Robert G. Anderson

Satin flower (Clarkia amoena subsp. whitneyi; syn. Godetia whitneyi) is a cool temperature, high light plant used as a cutflower in Japan, Europe and California. The stiking flower color patterns, large, long-lasting flowers and branching pattern could make this plant an important potted flowering plant. Cuttings, 6-8 cm long with flower buds (0.5-2.0 cm long), were harvested from secondary and tertiary stems of field-grown pinched plants of `Grace Red'. Cuttings were rooted in intermittent mist and potted in 10 cm pots two weeks later. The terminal flower buds and stem tip were removed one week later and the plants flowered within 4 weeks with 4-6 equal lateral branches. In the fall, `Grace Rose Pink' seed was sown Oct. 4, 1989, plants were grown under 100 umole s-1 cm-2 HPS 18 hr. supplemental light. Cuttings from the primary stem were harvested at the same stage, rooted in two weeks, potted and pinched one week later. Cuttings grown under supplemental light flowered 4 weeks later while cuttings grown under ambient light flowered over 10 weeks later. Over 70% of the terminal cuttings in supplemental light were 22-30 cm tall with 4-6 equal lateral branches that flowered uniformly.