I agree with Camille, all of my currently flowering 'chids are between 15" and 21" tall including spike and they are still quite compact plants.
I've seem pics on OB of some really large 'chids and I just wouldn't have room for one of them, but if the previous limit has been arround 12" then yes I could go bigger that that.
I also think Camille has a good idea about looking at the past project candidates as a starting point.
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Rosie
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