Paving stone

A paving stone for stabilizing soils with natural plant growth, the paving stone comprising a slab of substantially even thickness and having substantially flat upper and lower surfaces, a pair of oppositely disposed side walls and a pair of oppositely disposed end walls, and a plurality of elongate apertures extending from the upper surface to the lower surface, the cross-section of the apertures increasing in size from the upper toward the lower surface, the side and end walls being withdrawn inwardly in downward direction toward the lower surface, said paving stone being characterized in that said slab including webs defined between adjacent apertures and the side and end walls each include an upper curved roof-type projecting edge, the walls of the apertures, as seen in cross-section, being arcuately bent inwardly toward their upper ends, and the side surfaces being curved outwardly toward their upper ends whereby the radius of curvature decreases toward the upper surface of the stone, one of said end walls is shorter than the other so that the body of the stone is of a substantially trapezoidal configuration, the end walls are parallel to each other and the elongate direction of the apertures extends parallel to the end walls so that when arranging several paving stones side wall to side wall with the shorter end walls of all stones on one side, and the longer end walls of all stones on the opposite side, the assembly of paving stones covers an arcuate area, and when arranging several paving stones side wall to side wall with the shorter end walls of the stones alternately disposed on one side and on the opposite side with respect to the longitudinal extension of the stone assembly, the paving stones cover a substantially straight-line area.