Many growers wonder whether a medium thickness plastic can support both seasonal and extended growing cycles, and the answer largely depends on proper installation and environmental conditions. When installed correctly, 6 mil plastic can serve as an effective barrier against cold air during cooler months while still allowing sufficient sunlight to penetrate the greenhouse. In warmer seasons, it helps reduce excessive moisture loss and shields plants from direct wind exposure. Although it may not replace heavy insulated panels in extreme winter regions, it performs well for spring, summer, and fall growing, making it ideal for farmers and gardeners who need flexible seasonal coverage without committing to permanent structures.