Certainly saves on continually finding soil and seems to work well.
When the potatoes are pulled I just find some more composting material and mix it up with the grass.
Take the bottom stuff out at the start of the season, then start all over again.
The last two years I've grown Squash in the Compost Bin with great success.
Richard
![thumbs )t'](./images/smilies/023.gif)
![thumbs )t'](./images/smilies/023.gif)