Abstract: The invention relates to a cultivating channel for supporting substrate material and plants growing therein in a greenhouse, comprising two longitudinal wall portions, between which a cavity is present at least partially for discharging excess water that was previously supplied to the plants, wherein the cultivating channel is embodied in combination with supporting means for supporting the substrate material with the plants. The supporting means of the cultivating channel comprise a supporting plate having a supporting surface for supporting the substrate material with the plants, which supporting surface bounds the cavity at the upper side thereof.