A small space with a big sound

Courtyards are often the hardest-edged parts of a garden: paving, brick, gravel, a fence, a bin store. Water changes that character almost instantly. Even 30cm of moving water masks traffic noise, catches the light bouncing off walls, and draws in birds, bees and hoverflies that would otherwise pass straight over. The secret is to work at the scale of the space. A half barrel or a deep glazed pot will do everything a pond does in a fraction of the footprint — you simply choose the container and the plants with a little more care.

Choosing a container that will last

Size and material decide how easy the feature is to live with. A container at least 45cm across and 30cm deep holds a steadier temperature, gives roots room, and is far less likely to turn green overnight than a shallow bowl. Deeper is better still: 40–60cm lets you stand planted baskets on a shelf and still leave open water.

• Glazed ceramic pots — handsome and easy to clean, but check they are frost-proof and avoid anything with a narrow neck.
• Oak half barrels — traditional and generous. Line the inside with butyl if the staves have dried out, and keep the water level up so the wood stays swollen and tight.
• Stone or cast-concrete troughs — heavy, stable, and excellent in cold snaps. Ideal for a courtyard that never moves.
• Galvanised tubs — cheap and sharply contemporary. Zinc can be unkind to aquatic life over time, so line them with a butyl liner or a stout plastic inner.

Two practical warnings. Water weighs 1kg per litre, so a 100-litre barrel is 100kg before stone or plants go in — stand it on paving or a plinth, not on timber decking. And avoid anything old and lead-lined.

Safety matters. Where small children use the courtyard, keep water no deeper than 20cm, or fit a rigid metal grid set just below the surface. A shallow planted shelf around the edge also gives wildlife a way in and out.

Pumps, spouts and sensible wiring

A miniature feature needs very little flow. A low-voltage 12V pump rated at 200–400 litres per hour is ample for a bubbler or a small spout, and the transformer can sit indoors with only the low-voltage cable running out. If power has to cross the courtyard, use a weatherproof outdoor socket protected by an RCD, run the cable through conduit or tuck it beneath gravel edging, and leave a drip loop where it reaches the pump.

• A short length of copper pipe, a drilled slate or a stack of pebbles makes a convincing spout for very little money.
• Stand the pump on a brick or slate so it does not clog with leaves and grit.
• Solar pumps suit sun-trap courtyards, but flow stops in cloud — useful, not dependable.
• Before hard frosts, lift the pump out and store it in a bucket of water indoors. Float a ball or a piece of timber in the container to take the expansion, and never let a ceramic pot freeze solid.

Planting the water itself

Treat the water surface as ground to be planted. Aim to cover about a third of it with foliage and leave the rest open — enough shade to slow algae, but still visible water for drinking and reflection.

• Oxygenators: hornwort and water starwort, sold in bunches and simply dropped in. They compete with algae and shelter tadpoles and insects.
• Marginals: water forget-me-not, marsh marigold, brooklime and dwarf reed mace give height and soften the rim beautifully.
• Floating: a dwarf water lily suits a half barrel; water soldier is striking but can spread.

Plant in aquatic baskets of loam-based compost, topped with 2cm of gravel so the compost does not cloud the water. Three baskets is generous in a small tub. Top up with rainwater from a butt rather than tap water, which carries nutrients and feeds blanketweed. Never use ordinary potting compost — it will turn the water into soup.

Making it work for wildlife

Wildlife needs access and landing places more than it needs size. Break the surface with a piece of slate or a few pebbles so bees and hoverflies can drink safely. Birds will bathe on a shallow shelf if you leave one clear of plants. Most important, provide a ramp from ground level — a strip of gravel, a piece of roughened timber, or a gently sloping stone — so frogs and hedgehogs can climb out as well as in.

Choose single-flowered native plants where you can, leave seed heads standing over winter, and use no chemicals anywhere near the water. Moving water discourages mosquitoes from laying, and a small culture of daphnia in a bucket topped up with rainwater will keep the pool naturally clear.

Softening hard edges through the year

Site the feature where you can hear it from a chair and where its surface reflects something worth looking at — a warm wall, a large pot, a climbing rose. Then let plants spill over the rim: a fern at the base, heuchera, moss tucked into joints, a trailing plant in a neighbouring container. Group pots at two or three heights and add a few larger stones to tie the feature to the paving. In winter, leave the structure visible — an empty pot still reads as sculpture.

Aftercare is light. Scoop out fallen leaves fortnightly in summer, trim yellowing foliage in spring, divide baskets every second or third year, and top up with rainwater. Keep the gravel topping intact and the pump clear, and a courtyard the size of a dining table will give you the sound of a brook for years.