How do I repair a broken lawn edge?
The turn-the-turf-around trick that repairs a crumbling edge with no new turf, and how to keep the edge from breaking again.
- Difficulty
- beginner
- Time
- 45 min
- Read
- 3 min
Short answer
Cut a square of turf that includes the damaged edge, lift it, turn it round so the broken part faces inwards, and slide it back so the good edge is now on the outside. Fill the resulting hole with soil and seed. It costs nothing and is invisible in a month.
Edges break because the soil under them dries out, gets trodden or is undermined by a mower wheel. Repairing the turf without changing what caused it means doing it again next year.
What you'll need
- Half-moon edging iron or a sharp spade
- Plank as a straight edge
- Topsoil
- Grass seed
Step by step
- Cut a rectangle around the damage.Use a plank as a straight edge and cut a square or rectangle of turf that fully includes the broken section, with the cut lines running parallel and perpendicular to the edge.
- Undercut and lift the turf.Slide a spade under it about 40mm down, keeping the thickness even, and lift it out in one piece.
- Turn it round.Rotate the piece 180 degrees so the damaged edge now faces into the lawn and the sound edge sits on the outside line.
- Bed it back down.Firm it so it sits flush with the surrounding lawn. If it sits low, lift it and add soil underneath rather than pressing harder.
- Fill the gap that is now inside the lawn.Topsoil to just below the grass level, firmed, then grass seed and a light scatter of soil over it.
- Water and keep off it.Damp for a fortnight. Mark it with canes so nobody walks the repair while it knits.
- Recut the whole edge afterwards.Run a half-moon iron along the border line against a plank to give a clean continuous edge, so the repair does not stand out.
- Deal with the cause.If the mower wheel drops off the edge, cut a shallow gully along the border so the wheel runs on turf. If the edge is crumbling from dryness, a mulch on the border side helps.
Tips
- Turning the turf around is free and better than buying a strip that will not match.
- Cut the repair with a plank as a guide — freehand cuts show forever.
- A shallow gully between lawn and border stops the mower wheel breaking the edge again.
Common mistakes
- Just pushing the broken edge back into place — The soil under it has already gone, so it collapses again in the first dry spell. The turf has to be lifted and re-bedded.
- Patching with bought turf — A new piece is a different grass mixture, a different colour and a different texture, and it shows for years. The lawn's own turf always matches.
If it doesn't work
Repair sits lower than the lawn
Cause: Not enough soil underneath — Fix: Lift it and add soil rather than treading it down harder.
Seeded strip stays bare
Cause: Dried out or birds — Fix: Keep damp, cover with fleece, and resow if the season is right.
Edge breaks again in the same place
Cause: Mower wheel or foot traffic — Fix: Cut a gully so wheels stay on turf, or install a physical edging strip.
Edge crumbling all along the border
Cause: Dry soil under a narrow strip of turf — Fix: Mulch the border, and consider a permanent edging where the strip is very narrow.
Questions people ask
Do I need to buy new turf?
Usually not. Turning the damaged piece around puts sound turf on the outside and the hole ends up inside the lawn where seed can fill it invisibly.
When should I do this?
Spring or early autumn, when grass is growing and can knit the joints. A repair made in midsummer needs constant watering.
How do I stop it happening again?
Keep mower wheels off the edge — either by cutting a shallow gully along the border, or by fitting a solid edging strip flush with the turf.