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in Garden design
We used block paving bricks bedded in with sand. They're fairly firm and look pretty smart. They were less than 40p each, and you can choose which way up/what height you want.
Are they the same as housebuilding bricks? You can use them, they come in different colours - but I think you can get special ones that are more frost proof for gardens.
We found concrete versions of log roll a few years ago and used it to edge new paths we made in a woodland corner but it wasn't easy and cretainly couldn't be curved. I'm about to make a new path through some shrubs where the dogs have trampled and barged their way and will use treated wooden planks screwed to small vertical posts banged in at intervals.
I can cut the wood at angles to make the bends I will need but won't get real curves. However, once the irregular slabs have gone in and been filled around with chipped bark and the plants have spilled over the edges it will look softer and curvy.
THey're like normal bricks but without the holes. We have some on their ends, not that deep, but they're tight enough that when I gave the lawn a good soaking very little seeped through into the empty bed the other side. The other border, they're laid flat with a curve, I'll post a photo if you like. We'll be using the ones on their ends to hold in a 'deep bed' for veg.
If the curve is only slight you could use inch-thick tanalised board screwed to 2-inch square oak pegs.
My garden is all paths and borders (no lawn), all with curved edges, and all edged with logroll. I have just pulled up and replaced it for the same reason. I looked for an alternative but couldn't find anything that didn't look horribly artificial or could be made to curve successfully. I'm resigned to do it all again in 5 years time!
Use log roll again but back it with cheaper wood such as old pallet wood or wood from the likes of B&Q etc. That way you only ever need to change the cheap wood at the back every 5-10 years and the logs stay looking good.