What wood to lay as edging between grass and stone?

[CushionSpiral]

Need some edging between grass and stones, that sits flush with the ground. So no log roll or sticking up etc. options are either the driveway type bricks or wood. Wood is easier and quicker and can cut to funny shapes. But won’t last as long.

What type of treated wood do we need? Any advice?

Youd need pressure treated wood so the preservative goes into it, and isn’t just on the surface

Why the need for an edging? Is it because the grass is a couple of inches higher than the stone? I ask because I have a epcn stone edging around my lawn

Epcn = 30cm

We have railway sleepers (seconds so railway company doesn't want them and are relatively cheap). They are heavily treated with something and we used them between the grass and woodchip for the kids bit. Also made some stairs for deck. Been in the ground a good 8 years and no sign of any rot. Ask at local sawmill.

What about the metal or plastic edging strips you can get? You can knock them in to be flush with the ground if you wanted to be able to mow over them.

Ultimately any wood that you can get to do curves - and sleepers are great but very bulky and not ideal if you're going to sink them in to ground level - is going to be relatively small and liable to decay before too long, and you'll be having to do it again. Plastic or treated metal which will flex/bend might do for your purpose, it depends on whether you're retaining the grass or the stones really.