"Q. ... buds formed... then they turned yellow... What went wrong?

A. Depending on how you count, there are... at least a quarter-million orchid hybrids and varieties [how do you count ?]....phalaenopsis orchids and related hybrids... account for roughly 75 percent of orchid plant sales [roughly / smile...].Causes of bud drop include sudden temperature changes, low humidity, insufficient fertilizer [?], indoor air pollution from things like pilotlights [could you explain ?] and tobacco smoke, and perhaps most commonly, too much or too little water...enjoy the plant while it is in flower, and then give it to an orchid enthusiast [I would not do it !] and get something different. Repeat indefinitely"URL :http://www.nytimes.com/2008/02/28/garden/28qna.html?_r=1&ref=garden&oref=slogin