Lasagna gardening is a no-dig, no-till organic gardening method that results in rich, fluffy soil with very little work from the gardener. The name “lasagna gardening” has nothing to do with what you’ll be growing in this garden. It refers to the method of building the garden, which is, essentially, adding layers of organic materials that will “cook down” over time, resulting in rich, fluffy soil that will help your plants thrive. Also known as “sheet composting,” lasagna gardening is great for the environment, because you’re using your yard and kitchen waste and essentially composting it in place to make a new garden. Click here to read more from About.com on Lasagna Gardening.
Here’s a great article from Mother Earth News on the subject.
And here, you’ll find a find on Oprah.com featuring Lasagna gardening expert Patricia Lanza.
Hugelkultur is nothing more than making raised garden beds filled with rotten wood. This makes for raised garden beds loaded with organic material, nutrients, air pockets for the roots of what you plant, etc. As the years pass, the deep soil of your raised garden bed becomes incredibly rich and loaded with soil life. As the wood shrinks, it makes more tiny air pockets – so your hugelkultur becomes sort of self tilling. For more about Hugelkultur, visit this site.
And, from Permaculture Magazine, an article on the many benefits of Hugelkultur.