I've been growing P. moranensis outdoors for the past couple of years,
year 'round. Winter temps get down to about 30 F, but I don't think
they've taken a hard freeze. Plants have been in both peat moss and
in vermiculite. They flower profusely, produce divisions every year,
and in general do great. Same w/ P. agnata and P. gypsicola. This
year I'm trying a few others, but I don't know how they're going to
do thus far. It really helps to know the temp. distribution of the
plants as not all Mexican pings are created equal. Oh yes, P. x Sethos
also does great outside. I'm here in the San Francisco Bay Area,
near the Bay, which takes the edge off any hard temps in the winter.
Robert