Water gardens are easy and satisfying. A simple water garden for a sunny window is a vine grown from a sweet potato. Merely suspend the bottom half of a sweet potato in a bottle filled with water. The bottom of the sweet potato is the half which has no stem scar. Roots will form rapidly on the bottom half and sprouts on the top half.
Another simple water garden is the stem end of a carrot, cut with about 1 inch of the carrot, and placed in a shallow container of water. The stem will sprout into a beautiful green growth that will be a welcome sight in a bright, sunny window at any time of year.
Courtesy of August E. Kerr, USDA