First paragraphs: Las Milpitas de Cottonwood Farm in southwest Tucson is an unusual urban farm. On an intensely sandy stretch of land, bright green vegetables flourish in penetrating sunlight. Billowy clouds waft over observant mountain ridges. A straw-hatted farm manager sprints between rows to welcome his guests, avoiding plastic irrigation cable that will soon be buried along the rows. Las Milpitas is a farm owned by the Community Food Bank (CFB) of Southern Arizona. A working farm that produces food for the hungry, it is also a place where permaculture practices are honed, where an arid landscape is being restored, and where waste is composted into new fertility. Most critically, it is a farm where CFB constituents can learn farming ski...