Environment, Air Temperature & Humidity
Most plants grow well with room temperatures between 50° and 80°F, with a Ideal temperature of about 75°F. Your specific plant's needs will vary: think about where your species of plant originates and try to recreate a similar environment. Plants also need a certain amount of water vapor, or humidity, in the air to help control transpiration (breathing) and prevent wilting. On average, a relative humidity between 30 and 60 percent is good, with an ideal range of 40 to 50 percent. If your room is too hot or too humid for you, it is probably too hot and humid for your plants. Excess heat and humidity should be vented away from the growing area with exhaust fans. Alternatively, you can add a heater if the air is too cold, or a humidifier if the air is too dry. Environmental control equipment can be used to turn on fans when temperature or humidity rises, then turn them off when levels have dropped. You can also use a circulation fan in your garden area. This fan can run all the time to provide air movement around the plants, strengthening plant stems.