What is a good soil recipe for a great garden bed?

What is a good soil recipe for a great garden bed?

Tracy DiSabato-Aust (Garden Designer and Author) gives expert video advice on: What are the key steps to garden bed preparation?; What is 'double digging'?; Do I need to double dig my garden bed? and more...

One that I like to use is this: four inches of organic matter. And I use a combination of different organic amendments. I like to use two inches of a composted amendment that contains sewage sludge as well as leaf humus. And then I will also, in clay soils, use two inches of Canadian Sphagnum peat moss. Research has shown that this combination of the compost and the Sphagnum is a wonderful recipe to improve the soil structure, and in clay soil, improve the drainage.