Watercress is fun and easy to grow at home. Take a look at our article showing you how to use the grocery store watercress to start your own patch of watercress at home. Hydroponic Water Cress. This is an image of commercially hydroponically grown watercress.
Fog is the extreme of humidity. Humidity control systems add or remove water vapor from indoor air to stay within proper humidity ranges. Humidity control is important for three reasons: 1  It is a large factor in people's thermal comfort.2  Excess moisture in a building can lead to mold and mildew, causing problems for indoor air quality.umidity control systems add or remove water vapor from indoor air to stay within proper humidity ranges. Humidity control is important for three reasons: 1  It is a large factor in people's thermal comfort.
Heat. Keeping the greenhouse warm during cooler times, such as at night, will help prevent the reformation of moisture. Relative humidity, which means the amount of moisture in the air, is different depending on temperature. When there is 95 percent relative humidity and air temperature is 60 degrees Fahrenheit, for example, a plantâs leaf only needs to be 59 degrees Fahrenheit for moisture to condense on it.