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.

The parts list for this project is pretty big, but the end result is a system that keeps your plant watered and alive with almost no work on your part. It uses a bunch of cheap Radioshack parts, including a toggle, water pump, battery power, and a few relays. It's actually very easy to set up, and randofo's Instructable is clear and easy to follow. If electronics aren't your thing, you can also do a similar system with just a plastic bottle and a tray. Head over to Instructables for the full guide.

Self-Watering Plant | Instructables