General: Tropical orchids are no more difficult to grow than other plants, but because most of them are epiphytes (tree dwelling plants) their culture is different from that of other types of plants. British orchid growers failed in the early 1800's when they attempted to grow tropical orchids under dark, hot, and steamy conditions. They succeeded only when they realized that most tropical orchids grew at higher, cooler elevations and in the upper branches of trees where they got considerable light and perfect drainage.
Lighting: In the greenhouse, most orchids require some shading to prevent the leaves from overheating. In the home, however, orchids need the maximum light available. Placing them outside under the shade of tall trees during the summer months is very beneficial. Do not place them in full sun, however, or the leaves will burn. Also, do not place the plants on the ground, for insects and slugs (snails) can enter the pots and damage the plants. Pot hangers can be used to suspend the plants from tree branches, chains, strong trees, or other structures.
Temperature: In the home, placing the orchids in a room with relatively cool temperatures will help guard against dehydration. Most orchids are actually most happy at temperatures below the comfort level of humans, especially at night. Orchid greenhouses are usually maintained at 55-65 degrees at night.
Soil: Potting mixes for tropical orchids are loose mixtures of organic material such as fir bark (not pine bark), tree fern, osumda fiber, with small amounts of peat, perlite, cork, or charcoal added. The object is to have a mix that drains well, but holds some moisture. Most commercial orchid growers supply ready-to-use orchid mixes in small quantities. Orchids usually need repotting only once every two to three years.
Moisture: In watering orchids, it is best to soak the potting mix thoroughly and wait until the surface is relatively dry before watering again. Most orchids in fir bark based mixes will need watering no more than once every 5 to 7 days.
Fertilizer: All plants can be fertilized safely with a water-soluble urea free fertilizer such as Growmore 20-10-20 about once a month. Some orchid growers prefer to mix water-soluble fertilizers weaker than indicated on the package instructions and to use them every second or third watering. Always water before fertilizing and remember that it is best to under-fertilize rather than to over-fertilize. With the lower light and drier conditions in the home, orchids cannot use as much fertilizer as they can use in the greenhouse. Some growers like to increase the humidity around their orchids in the home by using "humidity trays" or trays of wet gravel around or under the plants. Pots should not touch the surface of the water.
Note: This guide is applicable to many varieties of epiphytic orchids such as brassias, cattleyas, everizroen dendrobiums, and oncidiums. For other varieties, please click on one of these links:
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