Many thanks! I looked everywhere on the internet and in the few gardening
books I had, but it's a very specific question. I'm grateful for your
expertise!

David
___________________________________________

Hi David,
The major concern would be the spacing. They will grow to 6' to 8'
wide or more, so space them accordingly.
http://tinyurl.com/96zpm

I'd say to make the boxes at least 3' deep or more.
Newt