I do not give any special care to my Cattleya rex plants (i have seven). My treatment is the same to all my cattleyas. I start watering in spring slowly when the new growth comes in sight. Little by little i expose them to quite high light, between waterings i let the compost dry almost completely. I never use tapwater.
In my greenhouse the temperature is daytime in summer + 22-28 C and nights about +16-18 C.
I fertilize my cattleyas twice in a month with normal orchid fertilizer.
Normally Cattleya rex starts blooming practically right after finished the growth. Sometimes you have to wait a little bit longer.
After blooming i give my Cattleya rex complete rest in good light but no water at all. Temperature in rest time is +15-18 C.
The dormant period last about 4-5 months.
Good luck to everyone
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