"willshak" wrote
shenk said

What i want is to build a flush to the ground, and open to the ground at
the bottom, TALL LONG raised garden. I am looking at 36ft long, about
2ft tall, and about 2ft deep.

Poured concrete? Where are you, and how are the winters there?

Well south of you. Norfolk area. Because it's much hotter here, open at
the bottom is a good idea so ground water leaches up gently at the worst of
the day. Unlike you, we get significant periods of 95F or more from late
July-early Sept.

I'm very used to container gardening, having lived much of my life in
apartments with no other options. The only thing optional about the height
of this unit, is if I want it taller.