8 years & up. This two-tiered GreenThumb Classroom Greenhouse protects potted plants while providing plenty of room for growth. Greenhouse features two sturdy wire shelves that keep plants off the ground and a clear vinyl cover that fits snug over the metal frame. Clear cover is made with a zippered closure to easily access all plants inside. Designed for year-round gardening indoors and outdoors. Assembly required. Greenhouse measures 36"W x 38"H x 19"D when assembled.