Donna, nice gardens. Would love to see pictures of your greenhouse(s)?
My friends husband who was 73 at the time did her whole back woodland garden and around the pool with that same form. He is 88 now and still going strong. He just re-painted the bridge a few days ago in this picture that shows how he put cement between the form lines to keep weeds from growing.
{{gwi:819807}}

Actually it was the edging in this picture

http://photobucket.com/albums/y233/hydrangeanut/?action=view&current=delphiniumsrosesLouisianairis.jpg

I like the concrete on also, and may need to consider that idea also.

I believe that is the same edging Annette. The forms make it look like a group of stepping stones was laid.

Your link goes to the whole page of photos. I assume you mean this one. It is the same form just connect the stones together by filling in with cement. My friends DH made 2ft wide path ways like your all up, down and around her trees. He then went back and filled in the gaps.