Ever since humanity lost the ancient Babylonian secret of suspending its gardens, growing produce has been a constant battle against vegetable-smuggling rabbit cartels. Marvel at a secure, indoor solution with today's Groupon for tours of the Sweet Water Organics urban farm. Choose between the following options:

• For $5, you get a public tour, offered on Wednesdays and Fridays at 6 p.m. and on Sundays at noon (a $10 value).
• For $19, you get four public tours, offered on Wednesdays and Fridays at 6 p.m. and on Sundays at noon (a $40 value).
  
  

Children 10 and under get in free.

Sweet Water Organics has transformed a warehouse where mining cranes were once built into an aquaponic ecosystem abounding in fish, vegetables, and herbs. Explore every inch of its inner workings with a tour through an indoor-wetland environment, guided by passionate, knowledgeable staff born and raised in the tomato beds. Along the way, groups will peer into tanks where more than 50,000 perch and tilapia work hard to provide nutrient-rich fertilizer for lettuce, cilantro, and several varieties of basil, which in turn filter water so that fish are exposed to lower levels of waste and advertising than conventionally farmed critters.

Sweet Water works to export its protein and produce to local restaurants and its sustainable methods around the globe. After the one-hour tour, guests can visit the in-house store for homegrown goods as well as coffee, meats, and dairy products from affiliated growers.