I came across this article the other day while researching organic gardening, and thought others might find it interesting as well.
Prior to the collapse of the Soviet Block Cuba got most of it's fertilizer and other agricultural chemicals from the Soviets. After the collapse their chemical supply was cut off. The city of Havana had been producing food through hydroponics. The hydroponic facilities were almost immediately converted to container gardens. Now small scale container gardens are all over urban Cuba, even in highway medians. These gardens now produce about a million tons of food a year. All of these gardens are sanctioned by the government, and use organic gardening practices (the only type of gardening allowed in Havana proper).
This practice in Cuba reminds me of Gorilla Gardening, but instead of being illicit, it is legal and encouraged. Just imagine what Gorilla Gardeners would be capable of producing if they were encouraged to produce.