Answer: Odontoglossum and Oncidium intergeneric hybrids are comprised of a large group of orchids from many different genera. The Odontoglossum/Oncidium alliance is very popular among orchid growers due to its cultural flexibility and striking sprays of long lasting flowers. The plants may be grown with relative ease in the home or under a sheltered patio.
The Odontoglossum and Oncidium alliance thrives on bright light. In the home, an east or a lightly shaded south-facing window is ideal. The plants need to adapt slowly to the increases in lighting. The leaves should be bright green as opposed to dark green or reddish green. Reddish green indicates too much light; dark green indicates not enough light.
Most Oncidiums and their hybrids are intermediate in temperature preference. For the best results provide nighttime temperatures of 50 to 60?F and daytime temperatures under 85?F.
Odontoglossums tend to prefer cool temperatures. For the best results provide nighttime temperatures 50-55?F and daytime temperature 60-80?F. Place the plants near a cool window in the home.
Depending upon the temperature, Odontoglossums and Oncidiums should be watered about two or three times a week. During the summer, the plants may need to be watered every 2-3 days. The rule of thumb for watering should be as followed : More heat more water, less heat less water.
Odontoglossums and Oncidiums prefer to be kept on the moist side. This does not mean that the plants like to be left in standing water. Try to water the plants early in the day, so that the foliage will be dry by nightfall.
Odontoglossums and Oncidiums prefer 50-65% humidity. Humidity should be increased with higher temperatures. Humidity Trays may be needed for plants grown in the house.
Odontoglossums and Oncidiums must be fertilized on a regular basis. For best results, use an Orchid Fertilizer in amounts as suggested on the package.
Odontoglossums and Oncidiums should be grown in either Medium Orchid Bark or Fine Orchid Bark Mix. They should be repotted once every two years. Ideally the plants should be repotted immediately after flowering.
Hope this answers all your questions!
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