Why a gravel path earns its keep in a British garden

Gravel is one of the most forgiving surfaces you can lay. It drains freely through a wet Cumbrian November, it shrugs off a dry Kentish July, and it costs a fraction of stone paving. It also suits the loose, cottagey planting many of us love — lavender, thyme and alchemilla spilling over the edges look far better against gravel than against concrete.

The catch is that a gravel path is only as good as what lies beneath it. Skip the preparation and you will be topping up ruts and pulling weeds within a season. Do the groundwork properly and you will have a path that lasts a decade or more with nothing more than the occasional rake. Here is how to do it, step by step.

Start with the line and the dig

Before you lift a spade, mark out the route. Run a line of string between pegs, or trickle a line of dry sand along the ground. A gentle curve usually looks more natural than a ruler-straight edge, but keep curves shallow — sweeping bends are easier to edge and to walk than tight wiggles. Aim for a finished width of at least 900mm, and 1.2m if two people will regularly pass or if you want a wheelbarrow to travel comfortably.

Now dig. You need to remove roughly 100mm of soil across the whole path, plus a little more at the edges so the finished surface sits just below the surrounding lawn or border. This is the single most important step, because it lets you build up layers without ending with a raised, trip-hazard ridge.

• Stack turf upside down in a corner — it composts beautifully into loam within a year.
• Keep the subsoil separate from the topsoil if you plan to reuse either.
• Check the fall as you go. A drop of about 1cm per metre encourages water to run off rather than sit.
• Firm the base with the flat of a spade or a plate compactor. Loose soil will settle unevenly and show up as dips.

Choose the right membrane and avoid the common mistakes

A woven geotextile membrane is what you want, not the thin black polythene sold for ponds. Woven fabric lets water pass through while blocking light, which stops most weed seeds germinating and keeps your gravel from migrating down into the soil. Buy a decent weight — around 100 to 150gsm is fine for a domestic path — and allow a 100mm overlap where sheets meet.

Turn the edges of the membrane up slightly against the sides of the trench so soil cannot creep back over it. If you are edging the path with timber, brick or steel, fit the edging first and lay the membrane up to it; the edging holds the gravel in place and gives you a crisp line to run a strimmer along.

Two mistakes trip up most first-timers. The first is laying membrane over an uneven base, which leaves the fabric bridging hollows that later collapse. The second is cutting the membrane too short at the edges, leaving bare soil for weeds to colonise. Take your time here; it is tedious work but it decides whether you spend your summers weeding or sitting with a cup of tea.

Building the sub-base for stability

On a firm, well-drained soil you can sometimes lay gravel straight onto compacted ground and membrane. On clay, or anywhere the ground stays squelchy in winter, add a sub-base of type 1 MOT aggregate or coarse crushed stone to a depth of about 50mm. This spreads the load of footsteps and stops the whole path sinking into soft ground.

Tip it in, rake it level, then compact it in two passes. A plate compactor hired for a weekend is worth the money; a hand tamper works but takes far longer. Rake the surface smooth again after compacting and check with a long straight edge laid across the path. Any rocker of more than a few millimetres will show through as a hollow once the gravel is on top.

Choosing gravel that suits your garden and climate

Not all gravel is equal. Angular, crushed stone such as 10mm or 14mm granite or limestone knits together and stays put, which makes it the better choice for paths on any slope. Rounded pea gravel rolls underfoot and migrates into borders, so it suits flat, contained areas rather than main routes.

• Colour: warm buffs and honey tones flatter red brick and terracotta pots; pale greys and creams suit slate, zinc and modern planting.
• Size: 10–20mm is the sweet spot for walking. Anything smaller shifts about; anything larger is uncomfortable underfoot.
• Depth: lay 40–50mm of gravel over the membrane, not the 100mm some guides suggest. Deeper gravel is harder to walk on and simply hides poorer preparation.

If you can, view the gravel wet as well as dry. British rain darkens most stone considerably, and a warm golden gravel that looks lovely in the bag can turn a flat, muddy grey after a downpour.

Spreading, settling and the first few months

Barrow the gravel onto the path in small heaps rather than one mountain at one end, then rake it out in layers, working backwards so you do not tread on fresh membrane. Use the back of a rake to level, and check the depth with a marked stick every metre or so.

Water the path gently with a hose to settle the dust and help the stones bed down. Expect a little migration at the edges for the first season — top these up in spring once everything has settled. Keep a bag of matching gravel in the shed for this purpose; a part-used bag at the back of the garage has saved many a tidy path from looking patchy.

After that, maintenance is a ten-minute job. Rake leaves off in autumn so they do not rot into the stones, pull the occasional weed that seeds on the surface, and top up every two or three years. Done properly, your gravel path will quietly carry you from the back door to the bottom of the garden through every kind of weather this island throws at it.