A small garden wall is one of the most generous pieces of growing space you have. It holds warmth, shelters plants from wind, and gives you a surface that runs upward rather than outward — exactly what you want when the ground is the size of a rug. Climbing roses are the classic wall plant, and trained well they will flower from knee height to the eaves rather than doing that disappointing thing where all the blooms sit in a great tangled knot at the top.

The difference between a wall of roses and a rose-trimmed roofline comes down to two jobs: tying the main stems out sideways and cutting the side shoots back each winter. Everything else supports those two moves.

Choose the rose, then give it something to hold

Not every rose suits a wall. Look for a true climbing rose rather than a rambler. Ramblers are glorious but enormous — wonderful on a long wall or a shed, yet they will swamp a narrow border and demand hard annual work. Climbers are more measured, mostly repeat-flowering, and easy to keep within two or three metres.

• Sunny south or west wall: most climbers will thrive here, including apricot, crimson and soft pink repeat-flowering types.
• East or lightly shaded wall: try 'Zéphirine Drouhin', which is thornless and scented, or the creamy 'Madame Alfred Carrière'.
• North-facing and gloomy: hard work for roses. Either accept a single flush from a tough rambler or grow something else entirely.

Fix horizontal galvanised wires to the wall on vine eyes, spaced 30–45cm apart, with the lowest about 30cm above soil level. Keep the wires 5–8cm clear of the brickwork so air can move behind the stems — that alone does more against blackspot than any spray. On rendered or painted walls, screw the vine eyes into plugs rather than tapping directly into old mortar.

Plant wide, not deep, and lean the stems in

Plant about 30–45cm out from the wall, with the graft union just below soil level, and lean the stems towards their wires. A rose planted tight against the base sits in the wall's rain shadow and spends its life thirsty, which shows up as pale leaves and a weak flowering season. Water it in well, mulch with well-rotted manure, and accept that the first year is about roots rather than blooms.

Why horizontal beats vertical

Roses flower hardest where a shoot is growing near to level. Sap rises quickly to the top of a vertical stem and most buds below it stay dormant — which is exactly how you end up with a bare wall and a bouquet at head height. Bend a main stem sideways and you change that flow. Growth is spread along the whole length, and a flowering side shoot breaks at nearly every leaf joint you have trained into place.

On a small wall, aim for three to five main stems, fanned out like the fingers of a hand rather than bundled upwards. Tie them in with soft twine or elastic ties in a loose figure of eight — one loop around the wire, one around the stem — so the stem never rubs. Tie in new growth every fortnight or so through summer, while it is still pliable. Bend it gently; hardened stems snap, and a snapped main stem is next year's structure lost.

Winter: shorten the side shoots, thin the old wood

In late winter, while the plant is dormant and before the buds swell — January into February across most of the UK — go over the trained framework with sharp secateurs.

• Cut every side shoot back to two or three buds from the main stem, roughly 10–15cm. These short stubs are where this summer's flowers come from.
• Leave the main stems long and tied in. Only shorten them if they have genuinely outgrown their space.
• Remove thin, crossing or rubbing shoots completely, cutting cleanly back to the main stem.
• Take out one of the oldest main stems every two or three years, cutting it low, and train a young replacement shoot into its place.

Tired wood is easy to spot once you know what you are looking at: grey, dry, congested and stubbornly flowerless. Anything you cannot picture flowering this year can go. Through summer, deadhead spent blooms back to a strong leaf and repeat-flowering climbers will reward you with a second flush into autumn.

Keep it fed and keep it open

Soil at the foot of a wall is drier and hungrier than open border soil. Water thoroughly in dry spells, especially in the first two summers, and soak the root zone rather than the leaves. Feed with a rose fertiliser in March and again after the first flush of flowers, and top up the mulch each spring.

The routine, in short: tie out horizontally through summer, prune the side shoots hard in winter, and take out a tired stem whenever you spot one. Do that for three years and the wall will fill with flowers from the ground upwards — which is precisely what you wanted from the space.