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Cymbidiums come in a broad range of flower colors. Their blossoms are noted for being very long lasting. In frost-free climates that have cool evenings, Cymbidiums are popular outdoor plants. These orchids require more light than Phalaenopsis or Paphiopedilums. In a greenhouse they can be grown in 25 to 50% shade. Miniature cultivars are the best choice for home gardeners without a bright greenhouse. These can be grown on a windowsill with a southern exposure. Helpful hint:if the plant has dark green leaves, it is not receiving enough light.
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The relative humidity around the plant should be 55-70%. You can attain this by growing the plants on a bed of damp sphagnum moss or on a pebble tray. Cymbidiums need cool night temperatures around 45 to 55 degrees F. for at least six weeks to set their buds. Daytime temperatures should be around 60 to 70 degrees F.
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Cymbidiums have no pseudobulbs to serve as water reservoirs so they must be kept evenly damp but not soggy. Drench them with a watering can whenever they start to dry out.
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Use a water-soluble fertilizer that is high in nitrogen from February to July and switch to a low nitrogen fertilizer from August through January.
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Cymbidiums prefer a fine fir bark medium, although any good terrestrial orchid mix will work fine. Repot every two to three years when new growth starts.