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.
Install horizontal air flow fans in your greenhouse. These improve circulation of air and help to expel humid air out. You may also want to install vents around your greenhouse. However, during the winter you need to take measures to control both the humidity and heat. The fans and vents cause temperatures to fall. This can result in condensation because the plants become colder than the air around them.