Urban Roots is a documentary about farming within the city limits of Detroit, and as such, it’s a handy way to get an education on the subject in something like 90 minutes.

It’s showing March 6 at the San Francisco Green Film Festival.

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Also, Shepard Fairey made the poster for the film, so even if you can’t be bothered to get your hands dirty, at least you can support the cause by spending $60 on a print of someone else’s picture with a Photoshop filter applied.

Urban Roots shows dedicated Detroiters working tirelessly to fulfill their vision for locally-grown, sustainably farmed food in a city where people – as in much of the county – have found themselves cut off from real food and limited to the lifeless offerings of fast food chains and grocery stores stocked with processed food.