The stake (1) has a cylindrical base plate (2) that is hollow at an upper end of the stake and arranged to be anchored in ground. The plate includes a slit (7) traversing the upper end in end to end manner and at right of one of vertical median planes of the plate. The slit is adapted to receive and maintain supporting wires (6). A lower end of an upright part (3) is adapted to be inserted in the upper end. The slit of the plate comprises a portion that vertically emerges upward outside the plate and downward in a housing that is broader than the portion.
