To keep the soil warm in a cold weather greenhouse, start by using thermal mass, such as water barrels or stone paths, which absorb heat during the day and release it at night, helping to stabilize soil temperatures. Insulating the floor with materials like foam or mulch can help retain heat and prevent the cold from seeping into the soil. Raised beds are another effective way to protect the soil, as they allow for better air circulation and can be easier to heat.
Using black plastic or other dark materials on the soil surface helps to absorb heat from the sun, warming the soil during the day. If necessary, you can also use soil heating cables or mats designed for greenhouse use, which provide consistent warmth to the root zone. Keep the greenhouse well-ventilated to prevent excessive humidity, which can cool the soil and create unfavorable conditions.
