Watering is important because water is being used as a source of heat. Therefore, we are using water as a source of heat because we know that dry soil freezes much more quickly than wet soil. In an unheated polyhouse watering may be needed as often as once every two weeks, while ground beds covered with microfilm usually don't need watering. Regardless of the method of overwintering, if possible, soil moisture should be checked periodically. Use a soil thermometer to verify that plants are in this range.
Fluctuations always occur during the winter.
F then ventilation should be provided. The final step prior to covering plants is to provide some type of rodent control. Many growers use commercially available baits while others have reported that human hair or cut up deodorant soap works for them. Thermal Blankets One of the simplest techniques growers have been using recently is called the thermal blanket. Containerized herbaceous perennials that are ready for storage can be placed pot to pot in an upright position and simply covered with a material having insulating qualities.