A plant’s dew point is the temperature at which the plant becomes completely saturated with moisture.
After the air surrounding the plant has been cooled to below a plant's dew point, it will start to form cloud droplets or fog, which can have hazardous consequences on the plants.
Because some plants display smooth surfaces, the vapor can condense directly upon the leaves, causing irreversible damage.
Dew points for plants are of particular importance once it starts to get cold outside. If a frost is predicted, there are several ways to protect your plants from dew-related damage.
For example, botanists recommend that you water the garden prior to nightfall. This will encourage the soil to diffuse moisture into the air that surrounds your shrubs and flowers, creating a warmer barrier to protect the plants.
In some cases, gardeners can also cover the plants with any kind of lightweight material such as bed sheets, plastic tarps, cardboard, or newspapers. It’s important to remove the covers in the morning as soon as the frost has melted in order to prevent additional dew-related damages.
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