Abstract: A plant enclosure for protecting outdoor plants from cool weather conditions generally comprises a sheet of thermally insulating material scored to form a plurality of panels. Each panel is substantially identically shaped such that the sheet may be expanded and formed into an approximately conical shape from a folded shape, the folded shape being substantially identical to the shape of each panel. A plurality of fasteners are attached to the panels and adapted to maintain the sheet in either the approximately conical shape or the folded shape. The plant enclosure is also provided with a hood portion affixed about an orifice through the upper portion of the panel structure for enclosing the upper foliage of a protected plant.