To learn more about window farming, check out this link from NPR:
“Window farming,” as it is called, is catching on in New York City and beyond. Window farmers use recycled 1.5 liter water bottles, clay pellets, plastic tubing and inexpensive fish tank air pumps to create their indoor gardens. There are now 4,000 registered users at windowfarms.org. Farmers are tending to their greens everywhere from the U.S. to Italy, Israel and Hong Kong.