I have an area between my yard and the neighbors that I use for vegetables, sunflowers, etc. It's a great area because it's so sunny. Our neighbors are thrilled to have us use this area to plant. I have a young child that helps me and they get a kick out of it.

The dirt is REALLY good in this area. I'd like to do some type of long skinny bed to help with weed control etc. But since the dirt is so good I don't think I need to do 6 inch boards. I was thinking of using lawn timbers (the kind that are rounded on the top) and making it about 1 foot wide.

What are your thoughts? What kind of ammendments would I fill the 'box' with? Esp. since it's only about 3 inches high.