The key to keeping the Pink Princess philodendron's leaves pink is to ensure they receive enough sunlight. Aim to give your plant about 6-8 hours of bright, indirect light daily. When indoors, the Pink Princess can also tolerate a couple of hours of direct sunlight.
Pink Princess Philodendron can be grown outdoors in USDA Hardiness Zones 10a-12b. Find your local hardiness zone here. Pink Princess Philodendron can be propagated by the stem method.
The PPP is so expensive because it's rare. Although it's a cultivar of Philodendron Erubescens, which is relatively common, pink variegation in philodendrons doesn't happen on its own that often. To produce the coveted mottled pigment, it must be grown from tissue culture.
