Among the least happy campers in my condo is a phal schilleriana seedling
that in March lost two leaves, leaving only one leaf, and has not grown any
new leaf since then (in about 7 months). The remaining leaf looks healthy
and the root system looks vigorous, but I wonder: is this young plant doomed
to die after all? and is there anything I can do to encourage it to grow a
second leaf?

Thanks,
Joanna