I have killed my fair share of kovachii seedlings in the past, so take this with a grain of salt. But I think I am doing better, as I have acquired several near mature plants, some of which are trying to put up spikes (but I think they are not quite big enough yet...maybe this year).
I think they like wet, and ideally cool. however they tolerated low 80s in the summer just fine last year for me. their natural habitat is I believe on the neutral/basic side.
They do NOT like acidic media, unlike many other phrags which thrive in for example sphagnum moss.
hybrids are of course much more forgiving.
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