Best and most nutrient rich soil mixture for gardening. Best soils for square foot or rasied bed gardening, container gardening, vertical gardening and companion gardening. This is called Mel's Mix from Mel Bartholomew from Sq. Foot Gardening.
Planning a garden in urban areas requires thinking creatively to maximize space. Whether it's vertical gardening or just thinking out of the (garden) box, you can almost always squeeze a little more growing room out of the space you've got!