The culture depends on the maturity of your plant. Here is Glen Decker's advice:
PipingRock Orchids Catalogue
In my experience with growing Phrag kovachii from flask, they grow best when small under phalaenopsis lighting, moist roots, cool temperatures - they grow best in the spring and fall - poorly in summer. They also enjoy an alkaline PH so add oyster shell (used for poultry for strong eggs) to the mix.
Treat as any other Phrag other than that. I have grown my seedlings for 1 1/2 years from flask and the largest are perhaps 12 inches+ across and the smallest have hardly grown 4+. I have lost only one seedling out of 30 under my conditions.
Here's another website with a lot of information from Alfredo Manrique in Peru:
Phragmipedium kovachii.com [Main Page]