The previous owner of my house made extensive use of what Home Depot calls "landscape timbers". Wood cut in a rectangular shape, with two sides cut curved and two cut flat.
They do not appear to have held up very well- most are rotted, and I don't think they are more than five years old. I'm ripping them out and replacing them with 'ground contact' rated treated wood and/or stone blocks.
Does anyone know what those 'landscape timbers' really are? Have they been treated in any way? New timbers at the HD are red, I cannot tell if it's simply paint, or if they have had any other treatments. Given the poor performance of the old ones, I do not intend to purchase any. I'm asking out of simple curiosity. I've tried web searches for information on them, but most of what I get is talking about rated pressure- treated wood, or railroad ties.