(Photo: Habitat Horticulture)

Here are some expert advice from two experts in the green wall industry. We pick their brains to find out how we can acquire the green wall of our dreams.

(Photo: David Brenner, founding principal and managing director of Habitat Horticulture. He has designed green walls for residences and commercial spaces all over California, including the San Francisco Museum of Modern Art and Anya Hindmarch’s flagship store in Los Angeles.)

Where is an ideal place to have a green wall?

A living or green wall has the most impact on spaces that you can really sit in and enjoy, especially when it covers an existing concrete or blank wall. Some of the most dramatic transformations are in light wells or basements.

How does one design an aesthetically pleasing green wall?

Beauty is in the eye of the beholder, and the client is the beholder in this case, so the client’s preference is the first thing I take into account. For any garden, matching various textures, colours, leaf forms and growth patterns helps to create interest. I strive for something that will look good not just on Day One, but remains so as it reaches a mature stage.

(Photo: Veera Sekaran, founder of Greenology. He has installed green walls notably in Changi Airport Terminals 1 & 2, and created the greenscape in Apple Store Orchard.)

How does the irrigation system work behind your green walls?

Most green walls are integrated with automated irrigation and dosing systems to deliver nutrient solution. The autoirrigation system usually requires a water inlet or garden tap, which is fitted with a timer and a fertigation unit so that water and nutrients can be fed to the green wall at specific timings in the day. Greenology’s system uses approximately 0.8 to 1 litres of water per square metre of green wall, considered one of the most waterefficient in the world.

(Photo: Greenology)

How does one choose the different species of plants for a green wall?

To reduce plant mortality, one should choose the right species of plant that can thrive in the site conditions. The homeowner’s preference will also play a part in the composition. For example, I am a big fan of ferns because they add volume and a jungle vibe, but others may prefer a neater look. For those who want a green wall with a high ecological value that will attract pollinating creatures, I suggest flowering species such as the lantanas and Tabernaemontanas. Those with young children can consider adding the pitcher plant into their green walls to spark curiosity and learning opportunities.