By Judy Fender

 Most cultivated orchids are epiphytes (air plants), and they should be planted in porous, free-draining media to stay “happy”. Dendrobiums need 50 to 60 percent humidity, which can be accomplished by placing the potted plant over a tray of water and pebbles or marbles. They should be kept evenly moist while actively growing. They have well-developed water-storage organs (pseudobulbs), often called “canes” for their upright, leafy appearance. When the plant has matured (as indicated by the terminal leaf), allow the plant to dry between waterings. Repotting an orchid should be done every 2-3 years before the potting mix breaks down. When you re-pot, be certain to allow for aeration and ample drainage (over watering and not enough air to the roots is a prime killer of house plants) as well as enough room to grow for about 2 years. (Dendrobiums grow best in pots small for the size of the plant.)
     Where do you place it indoors? Dendrobiums like bright light to about 50 percent sun. An east, west, or slightly shaded south window is ideal. If there isn’t enough light in your home, you might consider adding a plant light to promote good growth. Mature orchids respond to a 15 to 20 degree F. difference from night to day. If the temperature exceeds the parameters for this, be certain at higher temperatures that the humidity and air circulation are increased. Low temperatures (below 50 degrees F.) may cause leaf drop.
     Fertilize weekly during the growing season using about ¼ to ½ the recommended dilution of whatever fertilizer you choose to use. A balanced 10-10-10 or 12-12-12 fertilizer is sufficient for potted orchids.
     The American Orchid Society’s website is www.orchidweb.org. The Greater North Texas Orchid Society’s website is www.startelegram.com/homes/gntos/ The Fort Worth Orchid Society's website is www.lynx-ltd.org/fwos/