The invention relates to an assembly for arranging plants vertically, with a built-in watering system, applicable to plants contained in plant pots (11), consisting of a framework with individual supports for plant pots, a water container provided with a trickier in the upper part, a support with a drainage collector in the lower part, and plant pots, used to carry water to the upper container where it passes through the trickier and falls to an relief (8.1) in the body of the plant pot just below. From there, it is guided to an inner cavity (8.2) which finally allows the water to enter the plant pot. The excess water is ejected via a drainage opening with a conduit used as an extension and falls to the relief of the plant pot directly beneath, in order to repeat the process in the plant pots. These elements create a supporting structure for arranging plants vertically, with a watering system that operates under gravity.