Does anyone have any experience with garden wall replacement?

[csziggy]

12. As applegrove said, railroad ties are treated with creosote and not desirable in a garden

We had some that were left here on the farm (long story) and used them to make a raised bed around a tree whose roots were exposed. They worked but when I needed the raised beds nearer the house redone, I bought limestone boulders and had an expert install them. It was expensive and would not be practical in a small yard.

I like the idea of these DIY formed concrete pieces - on this page the man is making raised beds, but you could make walls out of them, too: https://manabouttools.com/make-concrete-garden-boxes/