In Tel Aviv Israel, on top of a shopping center, there is an urban garden on the rooftop and it is providing fresh vegetables to local residents using a hydroponic system that allows them to grow produce all year long. They are growing around 10,000 heads of lettuce per month along with other leafy greens, herbs, and fresh vegetables, not only that, but they also teach local residents how to best use the organic produce and start their own organic gardens at home. Technically the food grown via the hydroponic rooftop garden doesn’t qualify for organic certification in Israel because of a provision that requires all certified organics to be grown in soil, but the hydroponic system is able to grow food twice as fast and is able to utilize vertical farming as well. The lack of official certification doesn’t hamper demand as they have to restock the garden market up to four times a day in order to keep up. Through a project called Green in the City, they also provide workshops, personal hydroponic systems and even smaller commercial systems to help expand on the urban farming concept. This is a great example of how urban farming can be done on existing structures without interrupting their current function.