Perhaps the (what sounds like) extreme seasonal dryness may have something to do with triggering the bloom cycle (along with a reduction in the number of hours of daylight?). Interesting, I didn't know that "cool" in the habitat, per your recollection, really isn't my idea of cool. I've been raising my poor walkerianas in a meat locker! :-)
---------- Post added at 04:56 PM ---------- Previous post was at 04:32 PM ----------
I also just went back to review the Bakers' cultural sheet for C. walkeriana and it does state that winter nights "average 50 - 53 F." But Brazil's a big country, so maybe the area where this temperature range was taken was different from the area that you had visited, Estacion. Either way, it's good to know that the plants are adaptable and can apparently grow and bloom in a variety of environments.
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Steve
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