How long before Dendrobium kingianum keiki flowers?

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I have heard several lecturers say many clones of Den. kingianum keikii like crazy, but don't bloom. Because plant people can't bear to throw out plants, they give them to their friends, for whom they also don't bloom, and who also spread around the keikiis.

Fred Clarke of Sunset Valley Orchids recommends throwing away your non-flowering kingis and buying a seedling from parents known to flower each year.