The ornamental design for a hangingplanter, as shown and described.
FIG. 1 is a top perspective view showing the new design.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a left view thereof.
FIG. 5 is a right view thereof.
FIG. 6 is a top view thereof.
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a bottom perspective view thereof.
The broken away symbols in the drawings indicate that the appearance of any portion of the article between the break lines forms no part of the claimed design.