Spring or Fall, this will get your plants covered. Get your tender seedlings off to a healthy start as early as possible so your plants will be larger and hardier. Grow cold-tolerant crops like lettuce, kale, green onions and radishes well into the winter months. This Frame It All Extendable Cold Frame Greenhouse measures 4ft. x 4ft. and stands 36in. high at its peak. 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.