As a kid when I first got into Orchids, everything I read said that Cattleyas were hot growing plants that needed full sun. As I mostly grow Odonts I didn't think that Cattleyas could grow with them, however, as I liked them so much I still bought a few and they grow really, really well, even in a heavily shaded greenhouse that can go down to 8C in the winter (but average lows are around 10C). So maybe Cattleyas have a larger growing range than thought? I have no stunting, or plants that are just surviving, all my Cattleyas are large multigrowth plants that flower every year.