All you have to do is tell them in 25 words or less why you want or need to start a worm farm. The competition is only open to Australian residents and closes on the 13 March 2012.
Go on give it a go! Visit G Magazine's website for entry details.
There is also a blog entry on their website showing the successes a 12 year old has had in her worm farming adventures. Inspirational stuff and very practical.