If you can see it, it's mature! LOL!
I wondered that myself, as I typed it. It's all about the plant having enough energy to support a bloom. The leaf generates the energy and the p-bulb stores it. Four or five growths ought to be enough, if it's getting regular fert and enough light. My first growths were really runty, but subsequent ones get bigger as the plant finds its footing.
Some Catts put up a sheath and rest for a few months before setting a spike. My gaskelliana put up the spike shortly after growing the sheath. She's got three new growths this year, but she grew up a seed pod last season, so she might not be recovered enough to bloom. Check the thread out if you haven't seen it:
http://www.rv-orchidworks.com/orchid...o-journey.html
McJulie






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