Two great examples of guerilla gardening going vertical in the city of Toronto. Not only do the repurposed flyers serve as handy planting vessels, but when torn back they reveal an interesting visual archive that adds a bit of beautiful chaos to the already hectic urban street scene.
[via Makezine and Treehugger]

Japanese artist Hiroshi Sunairi has conceived a new twist on the idea of seed bombing by sharing seeds from Hibaku trees that survived the bombing of Hiroshima with gardeners from across the globe. The curated project, titled Leur L’Existence (Tree Project), offers seeds from numerous varieties that include Round Leaf Holly, Persimmon, Chinaberry, Firmiana simplex, Japanese Hackberry and Jujube. 
A blog chronicles the growth of these seedlings as they sprout across the planet, serving as a testament that life can truly be cultivated out of chaos and destruction. The endeavor will culminate on December 2009 with a show at the The Horticultural Society of New York, [...]