Gravel

Planning a Gravel Garden

Updated 1 June 2026 · Reading note

A gravel garden uses a mineral surface as both mulch and finish. Plants grow through a layer of gravel rather than bare soil, which keeps roots cool, suppresses many weeds and reduces watering. The approach has drawn interest in Germany as summers have become drier in several regions, since an established gravel bed copes with heat better than a conventional border.

Two different methods

Two approaches are often confused. The choice changes the planting and the long-term maintenance.

• Gravel over a membrane. A weed-control fabric is laid first, gravel on top. This is low-maintenance but largely decorative — plants sit in cut pockets and self-seeding is suppressed.
• Gravel as mulch. Gravel is spread directly over improved free-draining soil, with no membrane. Plants root into the soil below and can self-seed into the gravel. This produces a more natural, evolving planting.

Aggregate and depth

Angular grit and rounded pea gravel behave differently underfoot and visually. Local stone keeps the colour in step with surrounding paving and walls. A gravel mulch is usually spread several centimetres deep — deep enough to suppress weeds and keep the soil surface dry, which discourages slugs around the crowns of plants.

Edges and structure

Gravel migrates if it is not contained. A solid edge — steel, stone or a mortared kerb — keeps gravel off lawns and paths. For a stronger boundary or a change of level, a gabion basket reads naturally alongside a gravel bed, since both share the same mineral, free-draining character.