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Of all the orchids, cymbidiums are best suited for outdoor culture. They're prized for their sprays of large flowers, used as cut flowers or for corsages. Cymbidiums can be kept outdoors from early spring until late fall and can endure temperatures as low as 28 degree F for a very short time. After the first frost they should be brought into the house or greenhouse.
Blooming occurs from February to May. One bloom spike may carry as many as 30 flowers, each 4 to 6 inches across. The flowers can remain fresh and attractive for eight or more weeks.
Water well from March to October as new growth develops and matures. At other times, keep the potting mix barely moist but never dry.
Do not disturb plants too often because most cymbidiums bloom best when pot-bound. Repot after blooming and only when pseudo-bulbs become crowded against the edges of the pot. Water lightly after repotting.
Cymbidiums need a complete liquid fertilizer every two weeks from January to July. Fertilize once a month from August to December.
During the summer months cymbidiums need cool nights to initiate flowers. One way to help is to add ice to the soil. Do this every night in August after the sun sets. In the fall, keep plants outside until after the first frost. By doing this you will be rewarded with beautiful flowers.
Linda Whetsell, Smith County Master Gardener
Texas AgriLife Extension Service