For extra frost protection while planting in your VegTrug™ Patio Garden, use the VegTrug Frost Cover. Made from nonwoven polypropylene, it protects plants from cold temperatures, wind and frost, allowing you to extend the growing season earlier in spring and later into fall. To install, simply remove the greenhouse cover from the frame, and then install the frost cover in its place. Attaches with strong VELCRO® brand tabs. Zippers allow easy access to plants.