I'm embarrassed to ask this question, because I grow and sell houseplants as part of my business. However, I've never bothered with orchids as I think they're too fussy. My aunt died a few months back and I inherited her orchid collection since I'm "so good with plants." Things have been okay until now. One of my orchids has several buds that are on the cusp of opening, but they haven't opened yet and they should have by now. The buds are fully developed, but they won't seem to open up. I don't think the problem is due to the amount of light or moisture that they get. I'm sure I've got that down right. What else could be causing this problem?