Skip to site navigation

Green walls

Home  |  
Gardening > Advice  > Green walls
last updated Feb 19, 2014
Join the RHS

RHS membership

Get gardening advice all year round.

Join the RHS


Buy as a gift

Advertisement
Pyracantha

With gardens becoming smaller, making use of every surface makes sense and can look striking. Many types of plants will tolerate the high life in a green wall, from herbs and fruit to grasses and ferns. Whether in sun or shade, covering walls with plants can enhance the smallest of spaces.

Introduction Back to top

The benefits of green walls include:

  • deflecting water away from the walls during heavy rain
  • providing the building with an extra layer of insulation, so cutting down on energy loss and decreasing in heating requirements, even in modern, well-insulated homes
  • helping to keep homes cool in summer. Unlike brick and concrete walls, green surfaces don’t store up the sun’s energy in the daytime and release it as night-time in the same way
  • offering great aesthetic benefits
  • providing habitats for insects
  • contributing to improvement of urban air quality 
  • contributing to reduced noise pollution

Practical considerations Back to top

Types of green walls

At their most simple, green walls can just be a planting of wall shrubs and climbers. It’s hardly innovative, but claddings made from plants such as pyracantha or ceanothus can provide many of the benefits offered by more complex systems.

At the other extreme are engineered, planting systems. These often consist of modules fixed against a wall that contain soil or media for the plants to grow in. These often require irrigation systems and may need professional installation and maintenance.

Engineered green wall planting systems

Decide how you wish to plant your green wall. There are various systems available, according to the size of your wall and budget.

  • The simplest way of greening walls is to plant climbers, wall shrubs or fruit trained as espaliers or fans
  • With other systems, plants are set in cells containing compost or other growing media and connected to drip irrigation. Harvested rainwater can be used with some systems. These are installed by specialist companies
  • Green walls can be installed indoors with additional artificial lighting
  • For smaller budgets, there are simple grow-bag-type products for walls or you can plant up one or more small panels that can be added to, depending on space and budget. These are available from garden centres
  • Introduce the plants at as small size as possible, ideally as plugs. Establishment is likely to be more successful at this stage of development

Plant habitats

  • If the wall you are about to add plants to receives less than half a day of sun in mid-summer, choose plants for shade 
  • To simplify planting and watering needs, try to choose plants that have similar light and moisture requirements to the conditions on offer

When to plant green walls

Spring is the best time to plant because plants are coming into active growth and will establish quickly.

Further reading

Planting Green Roofs and Living Walls by N Dunnett & N Kingsbury (Timber Press, 2004 ISBN-9780881929119). This book is made available through the RHS Lindley Library.

Suitable plants Back to top

There is a broad range of plants available to clothe walls, and includes the following:

  • Climbers and wall shrubs are the simplest way of adding interest to walls. There will be a climber to suit your wall, whether in sun or shade
  • In green wall systems, a range of herbaceous perennials, grasses, herbs, fruit and vegetables can be planted 
  • Plants for summer interest (sold as annuals, patio plants or bedding perform well and are widely available as plugs in spring. Alternatively, grow plants from seed. Experimentation with different plants is also worthwhile.

Vegetables and herbs

Tolerant of shade
Alpine strawberries, chard, chives, land cress, lambs lettuce, lettuce, parsley, rocket and strawberry ‘Mara des Bois’.

Sunny positions
Strawberries: seed-raised everbearers (sometimes known as perpetual strawberries), such as ‘Aromel’, ‘Albion’ and ‘Mara des Bois’, oregano, thyme and shade tolerant fruit and vegetables with adequate irrigation.

Summer interest for walls

Flowering bedding plants tolerant of shade 
Begonias and busy lizzies.

Bedding plants grown for their foliage
Ipomoea ‘Sweet Caroline’
Ipomoea Sweet Heart 'Purple' 
Tradescantia ‘Purple Sabre’

Plants for summer interest – sunny
Begonia ‘Million Kisses Series’, Bidens ferulifolia, busy lizzie, ivy-leaved pelargoniums, petunias and verbena.

Hardy perennials

The following plants will thrive in sun too, as long as there is a good supply of water.

Shade-tolerant perennials
Ajuga reptens, often hardy Begonia evansiana, Bergenia, Carex ‘Evergold’, Cornus canadensis, Epimedium, ferns, Fuchsia magellanica, Heuchera ‘Key Lime Pie’, Heucherella, hostas, Lamium, Liriope, Lysimachia nummularia ‘Aurea’ (creeping Jenny), Pachysandra terminalis and Tiarella.

Perennials  for a sunny position
Erigeron karvinskianus, Euphorbia, Festuca glauca, Helianthemum and sedums.

Pyracantha

Pyracantha can be used to create a green wall simply by planting one against it and training the stems on wires.

Where to see green walls Back to top

The following places exhibit engineered planting systems. However, most gardens open to the public display wall shrubs and climbers that can also be used.

UK

  • Anthropolgie, Regent Street, London 
  • The Athenaeum Hotel, London has one of the tallest green walls in Europe
  • LG Arena, Birmingham
  • Westfield Shopping Centre, Shepherd’s Bush London boasts one of the UK’s longest living walls

Europe

  • Les Halles, Avignon
  • Musée du Quai Branly, Paris
  • Six Senses Spa, Paris
  • Trussadi Café, Milan
  • Herzog & de Meuron’s Caixa Forum, Madrid

Asia

  • Tai Pai National  Theatre, Taiwan

Quick facts

Top five plants for green walls
Heuchera
Thyme
Sedum
Carex
Ajuga
Advertisement