Measure first, then plan around the sun

Most townhouse plots are long and slim — often only three or four metres wide, with a wall or fence close on both sides. That shape is a gift in one way: it gives you a natural axis, a sightline from the back door to the far end. The trick is not to fight it, but to draw the eye down that line and make the space feel longer, calmer and more generous than its measurements suggest.

Before you buy a single pot, spend a week watching the garden. Note where the sun lands at nine in the morning and again at four in the afternoon, and which side stays damp. North-facing plots will want pale surfaces and shade-tolerant planting; a sunny plot can take olives, lavender and tomatoes. Also note the practical details — where the drain runs, where the water butt will stand, and whether your bin store blocks the view from the kitchen window.

Keep one clear route down the middle, roughly 90cm to 1.2m wide. Anything narrower feels like a corridor; anything wider eats the space you need for plants. Push your borders, pots and furniture to the edges and the garden will immediately feel more ordered.

Pale boundaries make a slim plot feel wider

Dark fences pull the walls inwards. Pale ones bounce light back into the garden and soften the sense of being hemmed in. A soft sage, a chalky off-white or a warm grey-green works well and sits comfortably with foliage.

• Paint both sides of the plot in the same colour so the boundaries read as one continuous surface rather than two competing walls.
• Match the shed, gate and any trellis to the fence colour. Visual clutter shrinks a space faster than lack of room does.
• Add a reflective panel behind a planter or water feature. A plain, frameless mirror or polished metal sheet, angled slightly downward, catches sky and greenery without looking tricksy.
• Lift the height of the boundary with trellis rather than solid panels — light passes through, and climbers have something to grip.

Paint in dry, mild weather and give timber a coat of preservative first. It is a weekend's work that transforms the plot more than any piece of furniture.

Grow upwards with vertical planters

In a narrow garden, the walls and fences are your largest growing area — use them. Wall-mounted troughs, stacking pots, pallet planters and downpipe columns all lift planting to eye level and free up precious ground space.

• Climbers for structure: star jasmine for scent, honeysuckle for evening fragrance, clematis for a long season of colour, and an evergreen such as ivy or a clipped pyracantha for winter interest.
• Edibles on the wall: herbs, strawberries, trailing tomatoes and salad leaves thrive in troughs fixed at waist height, where they are easy to pick and less troubled by slugs.
• Obelisks and tripods in the border give height without bulk, and can be moved as the seasons change.

Two practical points. Fix wall planters into brick or sound timber, not into mortar alone, and remember that a wet pot is heavy — use lightweight compost and check fixings each spring. Watering is the real challenge with vertical planting, so fit a simple drip line or use water-retaining granules and a mulch of gravel or bark to slow evaporation.

Choose furniture that folds, stacks or disappears

Bulky dining sets are the enemy of a slim plot. Look instead for pieces that earn their space only when in use.

• A bistro table of around 60–70cm diameter seats two comfortably and can be pushed against the fence when not needed.
• Folding chairs hung on hooks inside the shed or on a wall bracket free the patio entirely.
• A storage bench gives you a seat and somewhere to keep cushions, tools and children's toys.
• A wall-mounted drop-leaf table is ideal for a narrow terrace, folded flat when the weather turns.

Aluminium, teak and powder-coated steel cope best with British weather. Choose one material and stick to it — a mismatched collection of furniture makes even a generous garden feel cramped.

Divide the plot into small rooms

A single long strip can feel monotonous. Breaking it into two or three loosely defined zones gives the illusion of a much larger garden, because you cannot take it all in at one glance.

Try a seating area close to the house, a middle section with a bench under a climber, and a far corner with a single specimen plant or a small water feature. A change of surface — paving to gravel, or a low step up to decking — signals the shift without any need for screens. Gravel also adds sound underfoot, which is quietly pleasing.

Lighting does the same job after dark. A festoon strung on a catenary wire between two posts draws a soft line down the garden, while a couple of uplighters grazing the fence will make the boundary dissolve into the evening. The gentle sound of moving water masks traffic noise, which matters more than most people expect in a town.

Plant generously, then keep it simple

Narrow plots look best when planting is bold rather than busy. Repeat a handful of plants along both borders — a clipped evergreen, a frothy perennial, a scented climber — and the garden reads as deliberate and calm.

Keep the soil in pots topped up with fresh compost each spring, mulch borders in March, and cut back climbers in late winter before growth starts. A narrow garden is not a compromise. Handled with care, it is one of the most intimate and rewarding spaces a British home can offer — a green corridor that belongs entirely to you.