This photo was taken on June 8th. It may not looklike it now, but the vines of these young sweet potatoes will form a jungle of vines later this summer, and tubers will be bulging in the bags when they’re ready to harvest.. The plants were purchased from a local greenhouse and are now growing in 2 gallon grow bags of coir with rock powder mixed in for fertilizer. The bags are sitting in black trays. Bottom watering to a depth of less than two inches is done as needed. This is an example of passive hydroponics.
If you need to garden a little differently because of lack of space, poor soil, or some other reason, check out Mittleider Gardening at the Web site of the Food for Everyone Foundation. There you’ll find several e-books, such as Grow-Bed Gardening or Gardening by the Foot, which will guide you into the survival gardening methods that will work for you.