The best mulches for winter greenhouse gardening are those that provide insulation, retain moisture, and protect the soil from temperature fluctuations. Organic mulches such as straw, hay, and shredded leaves are great options, as they help maintain soil warmth and improve the soil’s structure over time as they break down. These materials also help suppress weed growth and maintain moisture levels, reducing the need for frequent watering.
Another excellent choice is wood chips or bark, which offer similar benefits and provide a tidy, durable cover. Inorganic mulches like black plastic or landscape fabric can also be effective, as they help absorb heat from sunlight, warming the soil and preventing frost damage. These mulches are especially helpful in areas where temperature fluctuations are more extreme.
