Known grid plates for seeding surfaces have cells each having a floor which is provided with an opening that is usually circular in shape. These openings are used, on the one hand, for draining the cells and, on the other hand, to enable root growth into earth below the grid plate. The purpose of the cell floors is to support the grid plate with respect to the earth, which is especially important when vehicles travel over the grid plates.
The openings at the bottom of the known grid plates are, however, not sufficiently large to ensure good rooting of grass with the soil. This results in a hindrance to the growth of the grass, drying out during long dry periods and the possibility of tufts of grass being torn out of individual cells.
In addition, it is also known to provide openings on the cell walls, as a result of which root growth between adjacent cells is possible. Although this increases the hold of the tufts of grass in the individual cells, the other aforementioned disadvantages remain.