The newest gardening community to hit the blogosphere is Blotanical and has been launched by Stuart Robinson of Gardening Tips 'n' Ideas, "down under" in Australia. He has put a lot of work into this site for the enjoyment of anyone who chooses to participate, whether it be a garden blogger or merely a garden blog reader.
It doesn't matter where you live, because after all, this is the internet. And that's the beauty of it. Bringing avid gardeners and bloggers together in one place makes it easy to get to know other gardeners and share information valuable to all of us. A community like this works because of the enthusiasm of its participating members and the more the merrier.
If you haven't visited Blotanical yet, you really should. You have nothing to lose but the time you'll spend visiting hundreds of garden blogs worldwide. See you there!