A plant border system includes a flat and a plant tray. The flat defines a flat cavity and a flat top opening communicating with the flat cavity. An upstanding rim surrounds at least a portion of the flat top opening. The plant tray defines a tray cavity and a tray top opening communicating with the...http://www.google.sh/patents/US6851221?utm_source=gb-gplus-sharePatent US6851221 - Flats and tray systems for plant borders and methods for using same
