The ornamental design for a plantproductioncontainer, as shown and described.
FIG. 1 is left side view of a plant production container showing our new design;
FIG. 2 is a top, front perspective view thereof;
FIG. 3 is a bottom, front perspective view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a rear elevational view thereof;
FIG. 7 is a front elevational view thereof;
FIG. 8 is a top plan view thereof; and,
FIG. 9 is a bottom plan view thereof.
The broken lines showing an environmental plant in FIG. 1 and portions of the plant production container in FIGS. 1, 4, and 5 form no part of the claimed design.