Cymbidium erythrostylum is native to Vietnam at elevations of 1500m (5000 ft). This species blooms in Oct-Nov for us, and all growers that I know. However, in the wild, Cymbidium erythrostylum is known as a spring to early summer blooming species. It is uncertain what causes the difference in cultivation.
We grow Cymbidium erythrostylum outside until nights drop below 5C (40F), usually in late November after flowering. We overwinter in our cool growing area (7-10C, 45-50F nights). The flowers on this species are relatively short lived, and susceptible to Botrytis spotting. The thin, crystalline petals and sepals tend to show more wear than other Cymbidium species. For these photographs, I brought the orchid inside for the bloom of the second flower stalk, to have a better chance of pristine white flowers.
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