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Dendrobium is a huge genus of orchids. We will address Dendrobium phalaenopsis, one of the easiest, most popular types to grow. In a greenhouse Dendrobium can be grown in 25 to 50% shade. For home gardeners try a windowsill with a southern exposure. For fluorescent light gardeners, stick with the compact varieties and grow them in the center and within a few inches of the tubes. If your Dendrobium has thin canes and is not blooming, it is probably not receiving enough light.
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Relative humidity should be kept in the 55-70% range. Keep the plant on a pebble tray or sphagnum moss to ensure the proper humidity. Dendrobiums prefer the same room temperatures as we do. Daytime temperatures should be between 70 and 85 degrees F., and should stay between 60 and 65 degrees F. at night.
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Dendrobiums should be allowed to dry out between watering. They have pseudobulbs that retain water so it is not necessary to keep them moist all the time. When you do water, drench them thoroughly with a watering can.
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A water-soluble orchid fertilizer that is high in nitrogen will work well year round for Dendrobiums. Read the container for directions on how much and how often to fertilize.
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Fine grade fir bark is the most commonly used potting medium for plants in pots 6" and under. Use medium grade bark for larger pots. Repot about once every two years in spring after blooming or when new growth starts.