Abstract: The invention relates to a relatively small, compact, easily disassemblable, hydroponic unit which comprises superposed telescopic trays one of which is provided with a free flowing liquid that may be transported by a pump positioned in the lower tray to an upper aggregate supporting tray by a suitable conduit whereupon it may thoroughly moisten the extent of the aggregate and flow back to the lower tray. The structure further includes suitable timer means for controlling nutrient flow as well as facilitating removal of the pump from the lower tray without disturbing the aggregate.