Live in an apartment or condo building with patch of under-utilized grass, ornamental landscape beds, or accessible roof-top? Why not pitch a community garden to the owner or property manager?
You could do what the folks at the MilePost 5 development here in Portland have done and make it a collaborative effort with a SPIN farmer, who installed and manages the garden, with residents volunteering their time in the garden and getting a share of the produce. It’s a win-win-win situation: residents get produce, dirt time, and gardening knowledge; SPIN farmer gets a plot and free labor; property managers/owners rest assured that the garden is professionally managed and won’t become an eyesore (a common objection).