P. lutea is a small, sulphur-yellow flowered ping. You
can find it in Donald Schnells book on US CP. I believe
it is native to the US.
That said, you may not have it. If the plant you have
is from the Guebler nursery, read the sheet that came with
it. It may refer to a blue or purple flower. If so you
probably have P. caerulea, also a US native. Both plants
grow in 50/50 peat/perlite. They go dormant in the winter,
but do not form tight buds. In winter you should cut
back on the soil moisture level. The plants will self-
divide every year or so, if they are happy. Be aware that
US pings are supposedly among the more difficult to grow.
However, if you don't overwater them, and respect their
dormancy period, they should do just fine. They are
susceptible to aphids, which infest the new leaves, and
squirrels, which eat the whole plant.
Robert