H2O IQ is a smart watering system hooked into a drip irrigation system. It includes an in-garden moisture monitoring device and a web interface. The in-garden device's moisture sensor is built of two nails submerged in plaster; the plaster absorbs water similarly to a plant's stem making this an effective method of measurement. The device also contains a servo which it uses to control water flow through the drip irrigation system. Finally, the device has a simple on-board microcontroller and XBee radio which it uses to update a server's record of its moisture as well as to query the server for optimal or desired watering settings. I designed the web interface and electronics code.