Why a gravel path earns its place in a border

A gravel path threading between herbaceous perennials does something a paved one cannot. It looks relaxed, it drains instantly, it muffles footsteps, and it lets the planting flop and self-seed right up to its edges. It is also one of the cheapest surfaces you can build. But gravel is only as good as the work underneath it. Skimp on the edging or the base and you will be topping it up every spring, fighting couch grass through it by July, and watching it migrate into the soil after every downpour.

The good news is that this is a weekend job for a path of reasonable length, and most of the effort goes into the first 100mm below the surface. Get that right and the gravel itself is almost the easy part.

Before you start, think about how wide the path needs to be. For a route you only walk along, 45–60cm is comfortable. If you want to push a wheelbarrow or kneel beside the border to weed, go for 75–90cm. Measure your widest barrow before you commit.

Set out the line and choose your edging

Lay a hose pipe or a length of rope along the route and adjust it until the curves look right from several angles, including from an upstairs window. Gentle sweeping curves read better than tight wiggles once plants have grown over them. Mark the line with sand or spray paint, then cut the turf with a half-moon edger and lift it. Stack it green side down in a corner — it makes decent loam in a year.

Edging is not optional. It holds the gravel in place, keeps soil out, and gives you something to strim and rake against. Your main options:

• Steel strip edging — slim, near-invisible, and ideal for curved paths. It must be set on a bed of concrete or firmly pinned with stakes to stop it drifting.
• Treated timber — cheap and simple for straight runs, but it rots eventually and can look heavy in a cottage border.
• Brick or granite setts on edge — traditional, robust, and expensive, but they look superb flanking a gravel path through a rose bed.

Whichever you choose, set the top of the edging roughly 10mm above the finished gravel level. That small lip is what stops a tidy path becoming a scatter of stones across the lawn.

Excavate and build a proper base

Dig out the path to a depth of about 100mm below your finished surface level. That allows 60mm of sub-base and 40mm of gravel. Keep the bottom of the trench firm and even — if the soil is soft or you hit old roots, remove them and tamp the subsoil with the end of a post or a plate compactor.

Now add 60mm of MOT Type 1 (often sold as scalpings), spread in two layers. Compact each layer thoroughly with a plate compactor, or a hand tamper if the path is short or awkward. Lightly water the surface as you go; it helps the fine particles bind and shows up any hollows, which you can fill and re-tamp.

Give the path a slight fall of about 1:60 across its width, or along its length if it runs downhill, so water runs off rather than sitting in it. Check the level with a straight edge and a spirit level as you work back towards the start.

Finally, roll out a woven geotextile membrane over the whole base, overlapping joins by at least 150mm and turning it up against the edging. Buy the heavier woven stuff rather than the thin fleece sold for hanging baskets. It will not stop every weed — nothing does — but it keeps gravel from sinking into the sub-base and slows the arrival of the persistent ones.

Pick the right stone size

This is where a lot of paths go wrong. Very small pea gravel is lovely underfoot but migrates badly and works its way onto lawns and into borders. Very large stone looks coarse and is horrible to kneel on.

• 10mm pea gravel — soft, quiet, good for bare feet, but it does travel. Best on flatter, contained paths.
• 14–20mm angular chippings — the best all-rounder. The angular faces lock together to form a stable, less mobile surface.
• Self-binding gravel or hoggin — firm and almost solid underfoot, ideal for a main route, but it loses that loose, crunchy look.

Think about colour against your planting, and avoid lime-rich stone if you have acid-lovers such as rhododendrons or pieris nearby, as dust can raise the pH. As a rough guide, allow 1 tonne per 10–12 square metres at a 40mm depth, and add a little extra for the first top-up after settling.

Lay, compact and settle the gravel

Tip the gravel in barrowloads onto the membrane, working backwards so you are not standing on finished surface. Rake it out to a consistent 30–40mm depth, keeping it just below the top of the edging. For angular chippings, go over the surface with a plate compactor in two passes — this knocks the stones into each other and firms everything up. Do not use a compactor on pea gravel; it simply bounces and the stones scatter. A light roll or your own footsteps will settle it instead.

Keep gravel 30–50mm clear of plant crowns and stems. Mounding stone against a perennial's base traps damp and rots it, and it makes dividing and weeding a misery. Where the path runs close to shrubs, a small gap of bare soil is worth having.

Leave the path to settle for a week or two, then top it up to level. After that, maintenance is mostly about raking it back into shape after winter, blowing leaves off before they break down into it, and topping up a barrowload every few years. Do that and a well-built gravel path will quietly hold its own for a decade or more, softening into the planting rather than fighting it.