I know posts on automated plant care are very popular on Gadget Master, so I want to highlight this Arduino appnote - Smart Farm Irrigation System Using Arduino Edge Control.

What are smart irrigation systems? Automatic irrigation systems have been around for years, turning the sprinklers on and off at prearranged times.

What happens when an engineer builds a smart garden? This Arduino-powered system automates watering while collecting real-time data on soil moisture, temperature, and sunlight. From sensor ...

To address this, Instructables user benrbill came up with a game-changing solution: an automatic drip irrigation system powered by Arduino.

[Nikodem Bartnik] built a system to handle it for him, keeping his garden on the grow. The system has an Arduino commanding an irrigation system based around a pump delivering water from a reservoir.