Start by Reading Your Balcony, Not the Plant Labels

Before you spend a penny on climbers, spend a week watching your balcony. Note which way it faces, when the sun arrives and leaves, and where the wind funnels through. A north-facing balcony in Manchester is a very different growing environment from a sun-trapped south-facing ledge in Brighton, and the plants that will screen you successfully in one may sulk in the other.

Then work out exactly what you are screening. A neighbour's kitchen window, a busy pavement, a car park or a communal walkway all demand different solutions. Often you do not need to green the whole side — a well-placed obelisk or a single panel of trellis, roughly a metre wide and two metres tall, is enough to break a sightline and give you somewhere to sit without feeling watched.

Do check the practicalities first. Leaseholders and tenants should confirm what can be fixed to walls or railings, and everyone should consider weight. Compost, pots and water are heavy, and saturated containers weigh considerably more than dry ones. Keep large pots closer to the wall or supporting structure rather than dangling them from a railing.

Supports That Suit Small Spaces

The right support does most of the work, and it should be chosen before the plant. For compact balconies, these are the options worth considering:

• Wall-mounted trellis panels, 30–60cm wide, fixed with masonry plugs into brick or render, or with heavy-duty adhesive pads where drilling is not possible.
• Tension wire kits — horizontal stainless steel wires on eye bolts. Almost invisible, ideal for rented flats, and excellent for training star jasmine or clematis along a wall.
• Freestanding trellis panels secured to railings with cable ties, which give privacy without touching the building fabric.
• Obelisks, around 1.8–2.1m tall, planted in a large pot. Weight the base with sand or gravel and tie the obelisk to the railing so it cannot topple in a gust.
• Expandable willow or fan trellis for awkward corners and narrow returns.

Whatever you choose, fix it firmly. A windblown trellis and its plant can do real damage — and a loose support rubbing against render will leave a mark.

Evergreen Climbers for Year-Round Screening

Evergreens are the backbone of balcony privacy, because they keep working in January when everything else is bare. Good choices for UK containers include:

• Trachelospermum jasminoides (star jasmine): glossy evergreen leaves, creamy white scented flowers in midsummer. Needs a sheltered, sunny spot and some winter protection in colder regions.
• Clematis armandii: evergreen, vigorous, with almond-scented white flowers in early spring. Prune straight after flowering to keep it within bounds.
• Hedera helix (ivy): unbeatable in shade and quick to cover, but keep it trimmed and away from painted render and neighbouring property.
• Lonicera japonica 'Halliana': semi-evergreen in mild areas, wonderfully fragrant in summer, and fast growing.
• Akebia quinata: semi-evergreen with chocolate-scented spring flowers and neat, palmate leaves.

For shadier balconies, Hydrangea seemannii and Pileostegia viburnoides are self-clinging evergreens that will happily clothe a north wall.

Flowering Climbers for Seasonal Interest

Once your evergreen framework is in place, add flowering climbers for colour and scent. Jasminum officinale is the classic summer-scented choice, and a late-flowering clematis such as a group 3 variety will give you a second flush from midsummer into autumn. Climbing roses work well in a large pot on a sunny balcony — choose a compact variety and keep it well fed.

Annuals are your secret weapon in the first year. Sweet peas, cup-and-saucer vine and climbing nasturtiums will romp up a trellis in a single season while slower evergreens are still finding their feet, giving you privacy immediately rather than in three years' time.

Pots, Compost and Container Care

Climbers in containers are entirely dependent on you, so get the basics right:

• Use pots of at least 30–35cm diameter for most climbers, and 45cm or more for vigorous ones.
• Plant into John Innes No. 2 or 3 mixed with multi-purpose compost for weight, structure and moisture retention.
• Add crocks or gravel for drainage and stand pots on feet so water never sits underneath.
• Water generously — daily in July and August, and twice daily during heatwaves. Saucers help, but empty them if they stay full.
• Feed with a slow-release granules in spring, then a high-potash tomato feed every fortnight through summer.
• Top the compost with gravel to slow evaporation and stop splashing during rain.

Wind is the real enemy on a balcony, drying leaves and snapping stems. A permeable windbreak mesh, rather than a solid screen, reduces gusts while still letting air through.

Training, Pruning and Pulling It All Together

Tie in new growth early and often, using soft twine or reusable clips, and pinch out growing tips to encourage bushier, denser screening. Prune at the right moment for each plant — Clematis armandii immediately after flowering, group 3 clematis in late winter — and never let a climber wander onto a neighbour's wall without permission.

For a small balcony, a simple arrangement works beautifully: a wall trellis along the longest side, an obelisk in one corner, and two or three pots of varying heights in front of them. Put the tallest at the back, add a few herbs at ground level, and resist the urge to cram too much in. Two or three plants grown well will screen you far more effectively than a crowded collection that never quite fills out.