Even if we restrict the discussion to the 17 classic unifoliate Cattleya species and ignore the bifoliate Cattleyas and the Laelias, we have species that bloom every different month of the year in natural conditions. They are controlled by variations in light, temperature, and water/humidity. When we start creating hybrids, it becomes almost impossible to predict.
Since most of us are stuck with only one or a few growing areas and can't vary light/temperature/watering individually for different plants, we sort of get what we get.
In general, Cattleyas need good light except maybe during their resting phase. They need higher temperatures and more watering and light during the growing period. Most of them will need some period of cooler temperatures during which things are usually kept drier. Doing this, we will still see different species and hybrids blooming at different times. That is actually the fun part because we can have Cattleyas blooming all throughout the year.
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