I don't think temperature differences are that important for Oncs, and the natural variation in the home during the fall will probably be enough. And also not a good idea to leave it outside until Thanksiving. Mine stays outside only during the summer. What they really need is bright light, or else they don't bloom. Also, some Oncs will bloom when the bulb is still immature, others when the bulb is fully formed. It really depends on the plant.
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Camille
Completely orchid obsessed and loving every minute of it....
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