personally, i think it's cussedness. i have one antelope type that took me YEARS to rebloom; now it grows/blooms like crazy. (no change in conditions.) i have a phal type that bloomed a couple times, sulked for a year, and is now blooming for the 2d time in about 6 months. (again, no change in conditions.) both plants are indoors in a western exposure. (and then i was given a nobile keiki in july; it bloomed in december.) go figure.
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http://www.oneplusyou.com/q/v/caffeine
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"Apart from the utility of binomials for standardizing reference for effective communication,
Laelia Speciosa is a tad easier to pronounce and spell than its Atzec name
chichiltictepetzacuxochitl."
--Alec Pridgeon