Temperature- Cattleyas adapt to a wide range of temperatures. Provide nighttime temperatures 55 to 60°F and daytime temperatures 70 to 90°F. Plants can tolerate temperatures of up to 100°F, if shading, humidity and air circulation are increased. Most cattleya can tolerate low temperatures into the low 40's for short periods of time.
Humidity- A range from 40 – 60-percent relative humidity is recommended. While relative humidity is naturally inversely proportional to temperature, the reverse is needed by cattleyas. That is, the humidity should rise with the temperature to prevent the plant from being stressed by transpiration. In greenhouses, under-bench misting activated by a humidistat is a practical solution. An alternative is to spray the walks and benches with water. In the home, place plants on a grid over a water-and-gravel filled tray, or mist them daily.
Fertilizer- Any balanced orchid fertilizer (look at the numbers on the container, 20-20-20, etc.) can be used to fertilize your orchid. Feed weakly (¼ strength) weekly works well for catts. Once a month use clear water to flush any accumulated salts from the potting mix. Increase the fertilizer to ½ strength when the plants are in active growth.