Christoph
>3:2 perlite/vermiculite mix
That sounds fine for most tropical (non-temperate Pings) as a starter.
Some prefer added lime (e.g. P. heterophylla) but the acid tolerant
plants seem not to minda neutral soil.
>I plan to keep the P. gypsicola bone dry
I know all the books advise this but I keep mine slightly damp. As long
as you check regularly, dry is fine. Add a little water if the resting
bud shrivels up (shrinks) after it has reached its dormancy size).
You'll know it, it looks as if it is shrinking too much!
>What is the maximum temperature range that the plants can tolerate in the
>summer?
My plants tolerate 120F which is hot! I guess they can stand almost any
temperature (hot, not cold!) as long as the light is indirect (direct
light will burn if it is also hot like sunlight) and as long as their is
a regular(constant) supply of water.
Regards
Paul