Passive solar powered plant watering system

A solar powered plant watering system comprising:

• a. container means for containing water, said container means being locatable for exposure to heating effects of the sun and including an air space portion in communication with contained water for allowing generation of water vapor pressures on exposure to heating effects of the sun when containing water wherein said air space includes means for sealing said air space portion;
• b. water delivery means comprising a conduit in direct communication with the contained water for delivering water from said container means in response to generated vapor pressures;
• c. a metering reservoir, said conduit of said water delivery means being connected to said metering reservoir for delivery of water from said container means to said metering reservoir, said metering reservoir having means for discharging water from said reservoir when a predetermined quantity of water has been delivered to said metering reservoir comprising a float operated valve mechanism including triggering means for rapid discharge of water wherein said float operated valve mechanism includes a float, a buoyant ball valve and a lift rod connecting said float and ball valve, and wherein said triggering means comprises a restraining device in engagement with said float for restraining displacement of said float until substantial buoyant forces are generated which overcome said restraining device and release said float.