The invention relates to a method of growing a crop comprising the steps of: growing a seedling (1) in a first growing substrate plug/pellet (2,4), placing the substrate plug/pellet (2,4) in a holder member (10,20), the holder member comprising a tubular body (11,23) and a flange (12,24) extending transversely to the tubular body, the body having a bottom (13, 22) with a root opening, placing a number of holder members in a growth tray (25; 35,36,37), the growth tray having a bottom (26) and upstanding sidewalls (27,28), defining an irrigation space that is adapted for receiving water and nutrients, and a top surface (29) spaced from the bottom (26), with openings (30,31) for receiving a holder member (10,20), the flange (12,24) being supported on the top surface (29), the bottom (26) being in fluid communication with the irrigation space, placing growth trays (25; 35,36,37) in a conditioned growth chamber (40) and exposing the plants to artificial light, after a predetermined period of time, removing of the growth trays to a harvesting area (50), removing the crop from the holder members (10,20) and transporting the crop through a harvesting device (52, 70) for separating fruit from leaves, and collecting the fruit.