A method of growing grapes comprising fitting a plurality of longitudinal sleeves to posts, respectively, each sleeve having at least one retainer； attaching at least two lines so that they are held by the retainers in an elevated disposition so that the lines at least partially support a grape vine； mechanically removing the lines from the retainers after harvesting grapes, each sleeve being secured to its respective post by fixing means so that the sleeves remain fitted to the posts when the line is being mechanically removed； pruning parts of the grape vine that remain with the lines when they are removed； and reattaching the lines so that they are again held by the retainers in an elevated disposition for further use.
