Cymbidiums are cool-growing orchids which will not flower if grown too warm, or under too much shade, and they do better under controlled greenhouse culture than as indoor plants. Their size is also a drawback as a house plant. If no greenhouse is available, or if the greenhouse overheats in summer, making it unsuitable, the cymbidiums can be summered out of doors for as long as there is no danger of frost.
They are mainly pink and white, with yellow less frequently seen. The flowers will last for several weeks, and old flower spikes will produce more flowers if cut back to a ‘node’ along the stem.
The plants are evergreen, and do not produce pseudobulbs. New growths are made each year from the base of the previous growth. The flower stem comes from the centre of a mature growth.
The species can be found all over the old world in the Far East to Thailand and the Philippines, New Guinea and Malaysia. The green- leaved types are cool-growing, whereas those with mottled foliage are the intermediate varieties. They are partly epiphytic and partly terrestrial, but in cultivation they like shady, moist conditions. Good house plants, they do even better grown in an indoor case. Paphiopedilums should be kept watered all year. They have varying flowering times and can bloom at any time. The blooms are extremely long-lasting from eight to ten weeks.
Re-pot when necessary immediately after flowering. Remove the flowers by cutting through the stem about 2.5 cm from the base after the last flower has been open for about two weeks. Potting can then be done earlier and the plant will have a better spring start. Remove the spike if repotting is not required; it will lessen the strain on the plant at a time when the new growth is getting started.
The sub-tribe Oncidiinae, which contains odontoglossums and many other natural genera, will interbreed with great ease to produce robust plants which seem to have a tremendous vigour. Whether in a greenhouse or on a windowsill, they will thrive given the very basic requirements. Many of them are ‘heat tolerant’ and appear equally at home in temperatures much too high for their true Odontoglossum ancestors.





