Abstract: A fixture adapted for mounting on railings and the like consisting of a pair of mounting brackets, each formed in a generally L-shaped configuration with horizontal and vertical legs. A horizontal projection on the vertical leg which includes a downward-facing vertical lip is adapted to be placed over and from the rear of the railing or similar structure. The horizontal leg also includes at its forward end a vertical lip which facilitates in retaining a horizontally disposed shelf or flower box in position on the support. Adjustment means are also included in both the horizontal and vertical legs to facilitate adaptation of the present support to a number of different environments and to a number of different-sized horizontally disposed objects.