The ornamental design for an in groundplanter, as shown and described.
FIG. 1 is a perspective view from the top of an in ground planter showing my new design;
FIG. 2 is a front elevational view thereof, the rear elevational view, left-side elevational view, and right-side elevational view all being mirror images thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a perspective view from the bottom thereof.
The broken lines showing a plant in FIG. 1 are included for the purpose of illustrating the invention in use, and form no part of the claimed design.