Plants are grown in grow trays. The grow trays are placed on a shelf that has rollers mounted on a top side of the shelf and a first stop at a first end of the first shelf. The first shelf is tilted so that grow trays placed on the first shelf will tend to roll towards the first stop at the first end of the first shelf. A plurality of light panels is mounted on the light support system at various locations over the shelf so that a first subsection of the grow trays will be illuminated by the light panels and a second subsection of the grow trays will not be illuminated by the light panels.