Blotanical is a site full of gardening blogs from all over the world which amongst other things, allows you to search for blogs in your area using an integrated Google maps feature. If you already have your own gardening blog, you can add it to the Blotanical aggregator along with your location and get connected with blogging gardeners in your area.
The more you participate in Blotanical, the more points you earn and the more points you have, the more influential your ranking of other blogs becomes. The blogs that receive the highest user rankings are displayed on the home page along with a top five list of most visited blogs and the 100 most recently added blogs as well.
Blotanical.com In Their Own Words
“Blotanical is a blog directory and social network where garden blogs bloom. Search for blogs by region of the world or using google maps. Add your own blog to the aggregator and participate by ranking your favorites”
Why Blotanical.com It Might Be A Killer
Rich in content, and very well-designed, this site is one of the better choices for gardening-related information and interaction. The ability to connect with others in your area through the Google feature is also a nice visual add on that people will like. The lay out of the blog and the hundreds of entries makes this a potential killer startup in the space.
Some Questions About Blotanical.com
Have they considered adding a shopping function that would allow people to buy recommended products directly from the site? This could help generate more revenues than Ad Sense alone and would be perceived as a value added service by users. 
