Cypripedium arietinum

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Berthold

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Is there anyone here who cultivates Cypripedium arietinum?

I'm afraid the small seedlings can't synthesize chlorophyll by themselves without mykorrhizal fungi support

Cypripedium arietinum Sämlinge.JPG
 
I've only ever seen it in the wild, growing with dappled sunlight in a thin duff of decaying pine and cedar needles with moss, over limestone. Wish I could be more help than that.
 
You might want to try to contact Bill Steele of Spangle Creek Labs in Minnesota. I know he had a sizable colony he grew from seed some years back. I'm sure he could give you some tips. One serious limiting factor might be summer-time heat. I suspect temperatures above 25 C are very detrimental to this species, as with other boreal or high altitude types like passerinum, guttatum and flavum. Good luck with your seedlings.
 
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