Julie of Reference Services recommends All New Square Foot Gardening by Mel Bartholomew:
It may not feel like it outside, but spring is around the corner and now is the time to begin planning for major gardening projects. All New Square Foot Gardening by Mel Bartholomew is a great resource. Square foot gardening is a raised bed system where a 4×4 foot bed is divided into sixteen growing spaces so a different variety of garden plants can be grown. This book provides the details for constructing the raised beds, what to plant, what soil mix to use, how to mix it and the quantity needed, as well as instructions for dividing the raised bed. It will give you all the tips you need to set up an attractive and productive garden.