An apparatus is provided for unattended watering of plants over an extended period of time utilizing a watering system that regulates a partial vacuum to control the discharge of water to the roots of the plants. A water reservoir is provided having an encapsulated interior cavity and an exterior exposed...http://www.google.sh/patents/US20090288339?utm_source=gb-gplus-sharePatent US20090288339 - UNATTENDED PLANT WATERING SYSTEM
