The ornamental design for a watering can, as shown and described.
FIG. 1 is a perspective view taken from the top, front and right side of a
watering can showing my new design, with the spray nozzle in an operative
position;
FIG. 2 is a perspective view taken from the bottom, rear and right side
thereof, with the curved spout in an operative position; and
FIG. 3 is a perspective view taken from the top, front and right side
thereof, the left side being a mirror image of the right side shown.