This section is from the book "The Gardener's Monthly And Horticulturist V24", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
The above Orchids can both be cultivated in the same way though they come from different countries. Owing to their mode of flowering they are best cultivated in pots, and I find that they are impatient of too much water when they are beginning to grow, being liable to damp off if too much heat and moisture is given at that time. I fill the pots to within two inches of the top with broken crocks, then fill with sphagnum moss tightly pressed down, and then make a mound nearly two inches high, and on the top place your plant. This is necessary, because the flowers are pendant. It would be advisable in making pots for orchids to have some small holes under the rims, through which to run copper wire to secure the plants on the moss. After they have become well routed the wire may be drawn out. This mode of potting is suitable to all the Tricopilias, Lycastes, Maxil-larias, Pilumnae, Bollaae, Batemania and other orchids that have large flowers with short stems. I prefer, with any of the above, to give the roots a good soaking, by putting the pots in water once every two or three days, to slightly damping the moss with a syringe. This will be often enough even when in active growth, and when they have finished, once a week will be sufficient.
Tricopilia tortilis and suavis do well with a rather dry temperature of from 50° to 60° from November 1st until April, and after that to be kept from 60° to 75°. It may be that at times the thermometer will go up to 90° in spite of shading, but it will do no harm if the house is kept well saturated with moisture. Odonto-glossum Cervantesii and all its near allies, are a little difficult to grow nicely, owing to our extremely hot and dry climate. They come from an elevation of about 4000 feet in Mexico in the shady valleys. The young growth is easily rotted off by too much heat and moisture, which is also the case with most cool orchids. I grow O Cervantesii in saucers, such as are used to place under flower pots, but the saucers are hung vertically, and the plants secured by wire through holes made for the purpose. I am growing many small Orchids in these saucers, which are one and a half inches deep and of various diameters. Odontoglossum Rossii, O. Ehrenberghii, Oncidium Kramerii, O. varicosum, all do well, and it is impossible almost to overwater them, even though they are dipped every day, in the growing season, as any surplus immediately runs off. These saucers can be made of any size.
O. Cervantesii should be grown as cool as possible in summer, and at about 50° through winter.