Grow Racks are a great alternative to the traditional Cold frame and can be used indoors as well as outdoors. They allow more vertical growing space, which is especially attractive if you've got spatial constraints or are a rooftop or balcony gardener. Our Grow Racks have a UV treated cover so they won't break down after prolonged exposure, and a reinforced zipper to allow easy access. Plus, the adjustable shelving allows more room for trailer plants.