WATERING TERRESTRIAL ORCHIDS
These, like the epiphytal Orchids, may be divided into two main classes, namely, those which lose their leaves annually, and those which are more or less evergreen. Some of the genera contain both of these classes, and notably the Calanthes. In C. vestita, C. Regnieri, C. rosea, and their varieties and hybrids the leaves turn yellow after the growths are fully made up, a sign which gives a good indication as to the necessity for withholding water for a lengthened period; while Calanthe veratrifolia and others of the class retain the last-made foliage green all the year round, the loss of foliage being in the old leaves, which should be removed at the first sign of decay. With these latter may be classed the Phaius, Zygopetalums, Cymbidiums, Cypripediums, and many others of evergreen habit, which require much care to be exercised in the matter of withholding water during the resting season, otherwise the plants will decline in vigour. After the growths are finished, most of these plants are benefited by removal to a cooler and more freely ventilated house for a few weeks, during which time the supply of water should be restricted, but they should never be allowed to suffer by being thoroughly dried. For Zygopetalums and other Orchids which it is customary to place in a rather drier atmosphere during the time they are in flower, such an interval would be sufficient rest.