It may not use water recycled from your air conditioner, but this compact self-watering solution is perfect for any size garden. It's extremely simple, too (apart from the Arduino, perhaps), and ...

In addition to the timer settings there is a manual watering switch as well. He used a typical mains light switch, wiring it with a pull-down resistor to make it work well with the Arduino.

The Arduino Plant Watering System is designed to automatically supply water to your plant's soil once its moisture level falls below a particular point.

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So if you're busy on vacation, or simply have a rough summer schedule, making it harder to tend to your beloved plants and garden, then this slow watering system may just be your saving grace.

Watering plants is tough to remember. You'll find all types of tricks out there to do it automatically, but Instructables user randofo's Arduino-powered system might be one of the more ambitious.

Green infrastructure (French drains, rain gardens, permeable pavement) goes well beyond watering systems. But Eness says this gateway to green infrastructure is low-cost and low-tech.

As Queensland's Darling Downs continues to experience one of its worst droughts on record, a scientist and a horticulturalist have developed a recycled watering system to keep their garden alive.