A vertical tier growing system for plants, the system comprising at least one vertically tiered shelf section (1) comprising a framework having longitudinal support arms (24) extending horizontally through the framework on which one or more plant trays (5) can be supported. The support arms (24) include a roller mechanism (26) extending along the length thereof and along which the or each tray (5) can be moved from one end of the section (1) to the other.
