Oh werd, well the sprinkler system should be for the grass, and the plants (dunno if you bought from a previous owner or built this house) should have the plumbing running to them for a drip system for the plants to regulate the amount of water that goes to the plants so that they don't drown if you don't have plumbing then you may have to run them to the plants or if you want water them manually


Here you go...
http://en.wikipedia.org/wiki/Drip_irrigation

It's basically what it is