A structure for creating housings for setting trees into the ground is proposed, comprising a plurality of modular elements (2), each one comprising an upper face (21) and support legs (22), said elements being associable with one another so as to obtain an upper surface (P, M), which is substantially continuous, and a lower volume (V), tubular extensions (24), which at least partially cover the legs (22), which, according to their length, determine the depth of the housing and hence the dimension of the volume (V). Said tubular extensions are held in position, before the subsequent positioning of said modular elements, by means of a framework, which is provided with supports (32) adapted to be inserted into the upper mouth of the tubular extensions themselves.
