The typical American Dream consists of a white picket fence surrounding a lush green lawn with a beautiful and bountiful garden. For urban America, that dream doesn't quite look like that. Instead, urbanites have to come up with innovative ways of attaining those qualities. The recently popular vertical gardens do just that.
These vertical gardens provide different layers of soil for roots to grow in and a trellis which the plants can climb up. There is even a vertical garden prototype called growing towers from Rodale Institute.
First, a thin layer of cloth or cardboard material is spread on the inside of the tower, which reduces eventual soil loss. Next, the tower is filled with soil laced with compost. Sometimes, an inner core of straw or wood chips reduces weight and soil compaction. Finally, fruits, vegetables, herbs, and flowers are transplanted into the sides of the tower.