Arugula in Austin. Mint in Miami. Rhubarb in Rio. While some of the press about the rise of urban farming suggests that it’s merely the province of artisanal-minded hipsters, the truth is that done correctly and at scale, it can be a smart, sustainable, and ultimately profitable use of valuable city space that can bring farmers and shoppers much closer together. A good deal of the credit for the urban agriculture trend goes to startup…