pgh wrote:
I am looking for a practical way to prolong the life
of the wood frame in the raise beds I will start building
pretty soon.

In my greenhouse I used cypress boards for the bench tops and
copper-napthenate treated Douglas Fir table legs. That was over 30
years ago and all is still OK.

Copper Napthenate Preservative is plant safe and is available at all
greenhouse supply houses and better hardware stores.

Cheers, Steve Henning in Reading, PA USA
Visit my Rhododendron and Azalea web pages at:
http://www.users.fast.net/~shenning/rhody.html
Also visit the Rhododendron and Azalea Bookstore at:
http://members.aol.com/rhodyman/rhodybooks.html