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Many orchids, like people, prefer intermediate temperatures, however, some orchids actually require a significant temperature change between day and night in order to grow well. Check the care specific to your plant to be sure. An over-under thermometer will help you to check the temperature ranges in your growing environment. HumidityIdeal humidity range for most orchids is between 40 and 70 percent during the daytime. An important thing to keep in mind is that humidity is measured as the amount of moisture in the air, not on the plants or in the potting medium. Humidity may be measured with a hygrometer, which may be purchased in many nurseries or hardware stores.There are several ways to increase humidity around the plants. In a greenhouse, watering the floor will raise the humidity level. For house growing, the easiest is to set your plants on trays filled with gravel, rock or marbles. Make sure that the bottoms of the pots do not sit in water. It is also a good idea to remove the rock or pebbles every month or so and wash them in a mild solution of bleach and water to remove algae or bacteria. A small fan blowing over the water will help to evaporate the water and increase humidity. Commercial or home humidifies may be purchased to help increase humidity. If you need to be away, you may put your humidifier on a timer during the day. Air MovementMoving air is essential to orchids. Stagnant air, combined with water sitting on leaves or plants is an invitation to fungus and bacteria. Moving air helps to reduce these risks. Air movement helps to evaporate any water, and also helps cool the leaves as temperatures rise, and eliminates cold pockets of air which may develop. Ceiling fans are an ideal source of air circulation for orchids, however, you may also run a small, inexpensive fan, directing the air movement away from the plants. In the greenhouse, you will need to run enough fans so that you do not have dead-air space.Growing EnvironmentsMany orchids may be successfully grown in the house, the greenhouse, and out-of-doors, depending on your geographic location, whereas some are very specific about their environments. Checking with local growers and orchid enthusiasts in your area will help you to grow orchid plants successfully, and in the environment in which they will thrive.
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