The ornamental design for a partitionplanter, as shown and described.
FIG. 1 is a perspective view of a partition planter showing my new design,
the plant and corner of a partition being shown in broken lines for
illustrative purposes only;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a side elevational view of the side opposite that shown in FIG.
1;
FIG. 5 is an end elevational view of the end opposite that shown in FIG. 1.