Path edging that lifts is usually the frost
I walked the side path after a hard frost in February. Three bricks were proud of the line. One had tipped into the gravel. I thought a boot had caught them. Nobody had been down there. The haunch had gone to mush in the autumn wet, and the frost had levered the bricks up. I pushed them back with my heel. By the next thaw they were out again, and the gravel was in the bed.
Path edging has one job. It holds the walking surface in and the bed soil out. On a small UK plot that is usually a line of bricks, a metal strip, or a timber edge between gravel and dirt. It is not a wall. It is not a fence. If it lifts, the gravel migrates, the bed slumps, and you spend March sweeping the same stones off the same soil.
Frost does the lifting. Water sits under a shallow edge. It freezes. It expands. Anything sitting on wet, unpacked soil comes up a few millimetres, then a centimetre, then it tips. A dry, well-haunched line stays put. A line you tapped into autumn mud does not. I have blamed the bricks. The bricks were fine. The ground under them was a sponge.
When I check a run I start at the soil line, not at the pretty face. Scrape back a short stretch with a trowel. If the edging is sitting on loose dirt with no packed backing, that is the fault. The haunch is the wedge of compacted soil, or a lean mix, that stops the edge from kicking out. If it has washed away, or was never there, frost has a handle. I also look at the path surface. Gravel gets topped up. The walking line rises. The edging looks short, then it is a trip, then a frost gets under it. Corners and joins lift first. I walk those after a freeze, not in June when everything looks tidy.
A fork and a spade are not the same digging tool. To reset a line I would use the spade to cut a clean trench and the fork only if I am loosening a packed patch without smearing wet clay. Reset in a thaw or in autumn, not on a morning when the ground is iron. Shove a brick back into frozen soil and you have made a gap the next frost will open.
Timber edging fails at the soil line as well as under frost. Gravel boards rot at the soil line is that failure on a fence. I would not treat a path edge as a second gravel board. If the timber is already soft where it meets the earth, reset will not save it. Take it out.
Skip roll-out plastic lawn edging held by thin spikes. The spikes pull in a frost. The roll kinks and the path leaks. Skip scalloped decorative pieces with no depth. They look like an edge and act like a lid. Skip laying bricks on bare soil and kicking them straight. That is how I spent that February. Skip a concrete haunch poured into a wet trench you cannot drain. You have cast a tray for ice. Skip using the path edge as the front of a compost bay. A compost bin is a box, not a bag of compost. Heap against an edge and you keep the soil wet on purpose.
A sagging gutter is usually the clips is a different lift. Ice in a charged run levers a channel that has already dropped. Standing water plus a freeze will move whatever you left loose.
This shows in late winter, after a hard frost, and it is an autumn job to put right. I now walk the path in October, once the beds have been used all summer and the gravel has crept. Reset the line then, pack a haunch, and leave the frost nothing to hold. If I wait until February I am heeling bricks back into mud and doing it again in March.
I do not need new edging because three bricks came up. I need the line to sit on something that stays put when the water in the soil turns to ice.
If I later add a buy link here, it will be a paid promo.