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Phalaenopsis or Moth Orchids are favorites ofmany gardeners. They are beautiful and among the easiest to grow of all orchids. Moth orchids come in a broad range of colors and bloom for up to three months at a time. Their light requirements are modest, much like Paphiopedilums. Avoid placing them in direct sunlight as it will burn the foliage. Generally speaking they have the same light requirements as African Violets. They perform well under fluorescent lights.
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Like most orchids, phalaenopsis benefit from a relative humidity from 55 to 70%. Placing the pot in a tray full of moist sphagnum moss or gravel will ensure a proper amount of humidity. The daytime temperature should be between 75 to 85 degrees F. with a nighttime temperature of 60 to 65 degrees F.
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How much water these plants receive is somewhat dependent on what medium they are growing in. If they are in a bark mix they should be watered thoroughly, about once every 3-5 days during the summer and about half as often during the winter. If they are planted in sphagnum moss they need to be watered whenever the moss starts to dry out. The leaves of the plants should be dry during the evening.
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Fertilize year round with a high nitrogen water-soluble orchid fertilizer. Follow the instructions provided with the fertilizer you are using for details on amounts and the frequency of feedings.
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Younger, rapidly growing plants should be transplanted when they need more space. Older mature plants can be repotted once every other year. Phalaenopsis can be repotted into the same size pot as they grow upwards and do not spread. Medium grade fir bark, medium grade orchid mixes and New Zealand sphagnum moss are popular potting mediums for these orchids.