Toronto artists Eric Cheung and Sean Martindale have been busy around their city, turning advertising posters into graffiti pocket planters. Introducing nature to the urban environment in ways that might encourage others to do the same, or to at least consider such possibilities.

On their blog Cheung writes:

A further addition to the Natural Urban Interventions. I see this as an impromptu architectural green wall system (or satire of one) that is cut out of existing poster spaces. Some may call it guerrilla gardening, but I see this as more of an ‘Urban Hack’ in its ability to jam an urban system and provoke reaction

They want you to join them, the planter templates are on the blog as well as photos and updates about how their urban project is going.