Stan Pierce wrote:

I found them today...called Mailbox Post Ground Screw. Anything to avoid
the digging of holes and filling with concrete would do for a boardwalk
round the garden surely. It only needs to be a foot off the ground.
http://www.exterior-accents.com/mapo...yword=mapogrsc

Stability?

What is the comparative price of cinder/concrete blocks?

Actually, I'd even do it in railway sleepers, since I have a chain saw.