Edging for bed

I have a bed which curves along one side of lawn , at the top more quadrant shaped which back side backs into open field, the right onto neighbours fence (open wood rails with open mesh farm style attached) . Being a sunny bed it has worked with no problem however the neighbour who does nil gardening has copied the quadrant although without any plants yet, lowering their side , my soil now sinks . My question is after all that what to use to keep the soil in , I have been looking at the green rolls of lawn trim not sure how effective they are though , anyone have similar to deal with ?
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My experience of lawn trim -is that it is a pain to install and even more of a pain to keep in place and a pain when mowing
So a bit of a pain
Slates, sleepers, old floorboards to name but three.
The thin plastic lawn edging stuff is less than useful as said. We have concrete edging strips all round our grass, but they are only about 6 inches tall so ypu possibly would need something which went further into the ground.
How much lower is the new area?
We've used railway sleepers to make a mowing strip between the lawn and the beds and also as a retaining wall to get a level veggie plot. We've used roofing beams to make reaised beds in the veggie patch. We've used 9" high concrete "log roll" to edge paths in the woodland garden and hold back the soil and plants.
I can recommend them all as edgers but you'd need something stouter than the log rolls to retain soil so I would go for wooden beams screwed to upright posts sunk into the ground so they don't sink away to your neighbour's garden.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
We used solid, seasoned wood. I have used log rolls but they do rot quite fast - unless mine were just too cheap!
why not dig a trench and place concrete slabs on there edge butting against each other . Please do not use old railway sleepers as these contain to many contaminants such creosote and diesel fuel oil .
Derek
They also bleed on your clothes if you are tempted to sit on them. You can buy new, untreated ones, though.
My sleepers were old na dhaven't bled at all. In fact they've dried to a silvery grey and they had black plastic on teh inside to protect them from moisture in teh soil and prevent any leaching. The shadier ones are actually growing lichens and mosses.
I've used wooden log rolls as edgers and they do rot very quickly really. The concrete ones are much better as long as they're supported somehow and are also growing lichens now.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I wouldn't have room for sleepers as its the side o bed bordering neighbour and already have brooms in there. Dragged OH up the garden and he tells me we have some old roof tiles and flags we could use , he will dig a trench to secure them in . Also have slabs of hardwood from the sawmill, too large to chop which will come in hardy also.
Many thanks for all your help , have even got OH doing some extras in the garden