The larger, terrestrial Cymbidiums mostly like cool conditions, with bright light and plenty of air movement, and the cool-growing types are not generally tolerant of heat for any length of time. Growing them outdoors during the summer in the UK, in a cool, but brightly-lit, position may benefit both cool and warm-growers. Misting them will help prevent them becoming too hot in warmer weather, and may need to be done several times a day. The cool-growing types may be put outside after the danger of frost has passed, and should be brought inside again before the weather turns too cold. Cool nights during spring and summer will help them to make good growth and aid flowering, but temperatures should not be allowed to drop below 50F, although short periods shouldn't do much harm if the plants are fairly dry. The warmer-growing types may be put outside or kept inside, according to preference.
Cymbidiums like to be kept moist, but not wet, so a well-drained but moisture-retentive compost is recommended. There are specialist composts available and we would recommend using them unless you are an experienced grower.
Humidity should be on the lower side of the range given here, and the temperature range given is the minimum winter nighttime temperature for the cool-growers. Where we are aware of temperature requirements this will be shown with the photo of the plant, but there are thousands of hybrids and it is not always possible to find the information. If in doubt please ask the person or company who supplied the plant to you.
Cymbidiums do not require a resting period, but the cool-growing should be kept a little drier during the coldest months, and fertilizer should also be reduced or withheld. The warmer growers may be watered and fertilized all year round if they are in growth.
Keep an eye out for pests, as Cymbidiums are susceptible to attack by red spider mite, as well as mealy bug, scale, and the other usual orchid pests.