Christoph
I grow all the SE US pings reasonably problem free (with a few exceptions
I'll note). I cannot grow them in terraria, and only have success in the
greenhouse. There, they are forgiving in culture. I think they require
good air circulation.
Exceptions are the forms of P.pumila, which is for me a short-lived species,
and I may have lost a few species the last year because of neglect...
Cheers,
Barry