NuVue Products 24042 Pop-Up Greenhouse, Multiple Sizes Available Durable Heavy Duty Transparent Cover Side vents allow for venting of the greenhouse to prevent over-heating on hot spring days; They also allow for watering access as needed Pops open and stows flat in the off season; Reusable year after year Protects from harsh weather conditions in the spring, including strong winds, heavy rains, overnight frost, insects and other pests Allows Sun's light to warm soil and accelerate the growing process for a lush, healthy plant