New concept - raised garden beds hugelkultur. Nothing more than a raised garden bed filled with rotted wood. This makes a garden bed loaded with organic material, nutrients, air pockets for roots, etc. Gets even better as time goes on.
101 PERMACULTURE DESIGNS, downloadable imgur album
Some really interesting ideas You can never pin too much info on Hugelkulture. I slready have my test bed started. Hopefully I get good results next year. One of the bad things about living so far North, the growing season is never long enough.