The ornamental design for a retractable planthanger, as shown and described.
FIG. 1 is a reduced front elevational view of a retractable plant hanger
showing my new design, the portion of a ceiling, the hook and the
suspended potted plant being shown in broken lines for illustrative
purposes only;
FIG. 2 is a front elevational view thereof, the rear being a mirror image;
FIG. 3 is a side elevational view taken from the right of FIG. 2, the side
opposite being identical except for the hook;