Here's a blog about the urban nature of Chile, I think with a bent toward plant life. It's in Spanish, but if you don't speak it (as I don't) you can click around and see some neat stuff anyway (some videos, too):
http://etnojardines.googlepages.com/
( example image )

I posted my own take on the urban nature of Chile (specifically Santiago) in 2005:

http://urbpan.livejournal.com/108244.html
http://urbpan.livejournal.com/109997.html
http://urbpan.livejournal.com/110800.html
http://urbpan.livejournal.com/111056.html