Abstract: This invention relates to a plant cube, comprising a block of mineral fibres, having a top surface, a bottom surface and four side surfaces, which block comprises a laminated structure of in parallel orientated mineral wool fibres, wherein preferably the laminated structure comprises substantially vertically orientated fibres, or wherein preferably the laminated structures comprises substantially horizontally orientated fibres.

Abstract: Mineral wool plant substrate formed of a coherent matrix of mineral wool having 99.9 to 75 wt % mineral wool and 0.1 to 25 wt % of an organic substance. Clay may be included in the matrix. The matrix may be in the form of a pellet.

Abstract: The invention relates to a coherent growth substrate based on a synthetic matrix containing clay in a quantity of 0.1-2.5% by weight such that at a suction pressure of pf=2 the moisture content is lower than 15% by volume, preferably for use as a grow-block and for a grow-slab.

Abstract: The invention relates to a growth substrate comprising at least one layer of short transversally extending mineral wool fibers and at least one surface layer of mineral wool fibers, wherein preferably the layer of short transversally extending mineral wool fibers is interposed between two surface layers of mineral wool fibers, or wherein preferably the layer of short transversally extending mineral wool fibers is interposed between two surface layers of horizontally extending mineral wool fibers.

Abstract: The invention relates to a system, in which water, optionally mixed with nutrients, is supplied to a substrate used for horticulture. Commonly an excess of water is supplied, so that it is necessary to drain the excess. Usually this is achieved by providing drainage hoses, in which an underpressure is maintained. To avoid that the roots of the plants grown in the substrate grow into the hoses and block these, the invention provides coupling members for coupling mineral wood to a drainage hose, when said coupling member is formed by a porous body arranged at least partly in said mineral wool and provided with a cavity connected to said drainage hose. According to a preferred embodiment the porous body of said coupling member is formed by mineral wool compressed such, that the density thereof is greater than the density of the non-compressed mineral wool.