I claim the ornamental design for a tree or flower bed edging, as shown and described.
FIG. 1 is a perspective view of a tree or flower bed edging of the present invention, illustrating the edging in a flat configuration;
FIG. 2 is a perspective view of the tree or flower bed edging of the present invention, illustrating the edging in a nearly circular and connected configuration;
FIG. 3 is a rear elevational view of the invention;
FIG. 4 is a front elevational view of the invention;
FIG. 5 is a left-side elevational view of the invention;
FIG. 6 is a right-side elevational view of the invention; and,
FIG. 7 is a top plan view of the invention, the bottom plan view being a mirror image thereof.