There is nothing like *P. sanderianum*
, petals 80cms long , and when the flowers are opening , the petals drop out folded to 2cm short segments and then they unfold and grow-grow-grow in length ...
The plant in nature is pendent and anchors itself in cracks in vertical limestone cliffs ...
And in cultivation the growing medium should be a mixture of broken crystalline limestone and durable moss (not Sphagnum) , and the compost should be kept damp at all times but not wet.
Also :: Cattleya light , not Phalaenopsis light ...