The ornamental design for a wallplanterassembly, as shown and described.
FIG. 1 is a perspective view of a wall planter assembly within an overall wall assembly;
FIG. 2 is a perspective view of the wall planter assembly;
FIG. 3 is an elevational view of a side of the wall planter assembly, wherein the elevational view of the opposite side of the wall planter assembly is a mirror image thereof;
FIG. 4 is a top plan view of the wall planter assembly; and,
FIG. 5 is a front elevational view of the wall planter assembly.
The broken lines depict environmental subject matter only and form no part of the claimed design.