Just came back across this thread. August 2016 I got a flask of Prosthechea karwinskii from Marni Turkel. The website said that she tries to get 25 seedlings in each flask. I potted them up in three "vigorous" compots and one compot of the "runts."
Almost a year later, I've sold and donated two of the compots. I kept the runt and 1 vigorous one. I've mounted or potted up 15 of the strongest growers and even the runt compot has several strong growers. Oh and I think overall there were at least 60+ in the flask and all of them made it!
Now I just need to wait two or three more years to figure out which ones are the strongest most fragrant bloomers.
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