Phragmipedium kovachii

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I think many of us trying to grow kovachii would like to know your potting mix, water, fertilizer, fertilizer concentration, and watering frequency.
Kept cool and bright under LED. In "ebb and flow" and watered with pure water containing calcium/mag. Very little fertilizer never exeeding 50 tds. I use growcubes and limestone.This one I have had since 2017, and quite a big plant now. It blooms in winter and sometimes a second time in summer.
 
Kept cool and bright under LED. In "ebb and flow" and watered with pure water containing calcium/mag. Very little fertilizer never exeeding 50 tds. I use growcubes and limestone.This one I have had since 2017, and quite a big plant now. It blooms in winter and sometimes a second time in summer.
What form of limestone do you use?
 
What form of limestone do you use?
Well, I suppose it's mostly calcium carbonate. Marble rock as well.
A mix of oyster shells and small stones. I add crushed egg shelves on top of the media a few times / year.
 

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