Automated hydroponic greenhouse factory

An apparatus for growing plants comprising:

• a pool for holding a liquid solution, the pool being substantially rectangular in shape with oppositely disposed first sides defining the length of the pool, and oppositely disposed second sides defining the width of the pool, the first and second sides adjacent to each other;
• a plurality of substantially identical trays configured for floating in the liquid solution of the pool and holding plants, each tray of the plurality of trays being substantially similar to each other in construction and dimensions, and the plurality of trays arranged in a plurality of rows in the pool, and the trays of a sufficient number, that for each row, there is a vacant gap of sufficient dimensions to receive at least one tray;
• and,
• movement members cooperatively arranged along the sides of the pool for moving the floating trays in accordance with a rotation, such that each tray reaches a predetermined location in the pool while traveling in the rotation, the movement members including pistons arranged such that for each row of the trays, there is one piston positioned along one of the first sides, with pistons of adjacent rows of the trays disposed on opposite length sides, and, at least one pair of pistons disposed diagonally along the second sides, the diagonal disposition dependent upon the direction of the rotation for the trays.