Get your tender seedlings off to a healthy start as early as possible with this Frame It All 4 ft. L x 4 ft. W Clear Extendable Cold Frame Greenhouse. With this plant home you can grow cold-tolerant crops like lettuce, kale, green onions, and radishes well into the winter months. Multiple units can be zippered together end-to-end, to create a continuous row of coverage. The zippered windows allow easy access for tending to your plants and controlling temperature and humidity. The powder coated steel frame will not rust or corrode, and the heavy-duty PVC cover will stand up to heavy wind or inclement weather. Easy to remove and replace. When hardening off seedlings you may want to remove the cold frame completely during the day and replace it overnight.