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Increasing flower production and manipulating the flowering season of potted ornamental plants would help provide a competitive edge for floriculture producers in Hawaii. Photoselective shadecloths that modify the light spectrum may be an approach to achieve these aims. The objective of this study was to determine the effects of photoselective shadecloths on the flowering of potted orchids. At the University of Hawaii Magoon Facilities (Oahu), two kinds of orchids were grown in a saranhouse in chambers built with PVC pipe covered with the four shadecloths—black (control), gray (diffusive), red, and blue—each providing 30% shading. With M-10973 Rhv. Herbert Kurihara `Flori' orchid plants, more buds and flowers were produced under the black and red shadecloths than the other two shadecloths. The black and red shadecloths resulted in similar earlier starting dates of bud appearance (4 Aug.2005) and flower appearance (4 Aug. 2005). Whereas, under the blue shadecloth, bud appearance (18 Aug. 2005) and flower appearance (31 Aug. 2005) were delayed. Under the black and red shadecloths, flowering ended earlier (27 Oct. 2005). When flower production resumed, new spikes were produced earliest under the red shadecloth (1 Dec. 2005). No new spikes were produced under the black shadecloth. For M-10878 Colmanara Sphacetante `Evelyn' AM/AOS orchid plants, spike formation occurred later than with the M-10973 plants. Spike formation occurred on the same date for all shadecloth treatments (10 Feb. 2006), with similar numbers of spikes. Thus, photoselective shadecloths influenced flowering, but their effects varied with the orchid.

(77) Effects of Photoselective Shadecloths on Flowering of Potted Orchids