The Yamamoto Orchids Web site [formerly said that:]
The brief version is keikiis rather than flowers are caused by fertilizing too late in the summer, and too-warm winters. They recommend stopping fertilizer completely in mid August. but continuing to water until growth matures. Then they recommend reducing water, but they say it isn't necessary to stop it and force all the leaves to fall.
They recommend 6 weeks of winter nights below 55 F / 13C. Many people get a flush of flowers with Den. nobile hybrids in early winter, then again in spring, due to low night temperatures through the winter.
Last edited by estación seca; 06-14-2020 at 02:51 PM..
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