A plant packaging and covering system comprising a floral sleeve having a base portion and skirt portion. The sleeve comprises a shrinkable element constructed of a material shrinkable by heating or other means, wherein when the shrinkable element is caused to shrink, a constricted area is formed in the sleeve to help secure the sleeve in a position about a pot, floral grouping, or growing medium disposed therein. The sleeve may have an upper portion which can surround and protect a plant disposed in a pot and which can be detached once the protective function of the upper portion has been completed, thereby allowing the skirt portion to extend from the base portion. The sleeve may have a plurality of expansion elements in the base portion, or may lack such expansion elements.