Odontoglossum Hybrids
Cool Growing Oncidium (Odontoglossum) Intergeneric Hybrids Intergeneric hybrids consist of several different genera that are can be crossed together to create new "man made" intergeneric orchids. The result of these hybrids leads to new genera names that can get pretty confusing. Odontoglossum intergeneric hybrids include: Wilsonara "Wils." (Cochlioda x Odontoglossum x Oncidium); Odontocidium "Odcdm." (Odontoglossum x Oncidium); Odontonia "Odtna." (Odontoglossum x Miltonia); Vuylstekeara "Vuyl." (Cochlioda x Miltonia x Odontoglossum); Burrageara "Burr." (Cochlioda x Miltonia x Odontoglossum x Oncidium)
Light & Air Most Odontoglossum hybrids prefer filtered, subdued light . Odontoglossum Intergenerics enjoy moist air, requiring a minimum of 40-50% humidity in the immediate vicinity of the plant. The ideal humidity is between 55% and 75%, with as much ventilation or air movement as possible without any cold drafts. Humidity can be increased around the plant by placing the pot on an inverted saucer in a baking pan filled with pebbles, rock chips, etc., and water. Keep water level below top of pebbles so that plant will not have "wet feet" from sitting in water.
Temperature Odontoglossums and some of their hybrids are cool in their temperature preferences. Ideal temperatures for them would be 65-70°F degree highs (day) and 50-55°F lows (night) but most grow and bloom well in homes with 65-80°F highs (day) and 50-65°F lows (night).
Water & Fertilizing Odontoglossums must be kept continually moist (but not soggy and waterlogged) below the surface of the potting media. Fertilize your plants as least once a month. Take care to keep water out of the new growth at the base of the plant. Never allow the bottom of the pot to stand in water
Potting Odontoglossum types need to be repotted at least every year to 18 months. As a general rule, repot them when the new shoot is two to three inches tall or when new roots appear. All the old mix should be removed from the roots and any dead roots should be removed. If dividing, keep the divisions in clumps of three to five mature bulbs. Medium to fine fir bark is preferred. The base of the new growth should be potted at ½" (no deeper) into the fresh bark. Keep mix barely damp until you see the new roots penetrating the bark, and then resume normal watering.