How to Get Cymbidiums to Bloom in Warmer Temperatures

Light

• As cool season plants, cymbidiums often refuse to bloom as the temperatures rise. Part of the reason is light. The warmth associated with the bright light they require for producing buds is often available only through the warm season of the summer, and the high, corresponding temperatures act as a double whammy, discouraging bud formation. There are several ways to deal with the problem and encourage the plant to bud. Mist the plant frequently during the heat of the day to keep it cool. Only expose it to full sun in cooler areas of the country where daytime temperatures do not exceed 75 F. Shade the plant in the winter, and particularly just before bloom.

Temperatures

• In addition to not exceeding 75 to 85 F daytime temperatures, cymbidiums prefer to grow flower spikes once night time temperatures drop to between 50 and 60 F. They can also tolerate some light frost, but frost can easily kill the plant. Miniatures tend to be somewhat hardier than the larger standards. To encourage bloom when in bud, attempt to maintain a constant temperature of between 55 and 75 F.

Culture

• Humidity, food and water are also factors in producing cymbidium flowers. Water is required heavily during the growing season, but the plant should be kept almost dry throughout the winter after the psuedobulbs have formed. Maintain a humid atmosphere through the summer by misting or placing it in a greenhouse. Keep relative humidity levels at 40 to 60 percent through the winter. They require more nitrogen through the growing season, spring and summer, and more phosphorous in late summer when bloom spikes are being formed. Monthly feeding is recommended throughout the winter.

Growth Habit

• Since cymbidium orchids are a cool season flower, it is necessary to alter their environment if you expect blooms during the off season. Through complete climate control, proper care and feeding and regulated light, you may succeed in getting blooms in the summer, but this is not natural to the plants. However, if you live in a warm climate but still desire these beautiful blooms, following the above steps can set you on your way to spectacular winter flowers, even if you do not have much of a winter.