They’re the gardens that don’t grow on trees but they do grow on walls. We’re talking, of course, about the emerging shape of vertical gardens.

Vertical gardens are certainly growing in popularity with more and more gardeners willing to experiment with spaces that were only ever furnished with creepers and climbers. They have become the inspiration for gardeners to think laterally – or at least, vertically.

While this new frontier has predominantly been the domain of outdoor gardens it beckons trials for gardeners to take this concept indoors. And, why not? Many of the plants that have proved their worth in outdoor situations – plants like succulents, ferns and epiphytics – are likely to perform equally as well indoors.

The reason is simple: most vertical gardens don’t grow on walls that are drenched in sunlight. If they were, many of the plants would suffer so instead they are often kept in the dark – or with very minimal sunshine.

However, the obvious issue with bringing a vertical garden indoors is that gravity has a nasty habit of doing something awkward with the liquid nutrients. In most indoor plant containers, gardeners catch the runoff with a drip plate but with vertical gardens the idea requires a very LARGE drip-tray.

Essentially this is what is needed. But, to take it one step further, the drip tray has two other issues to contend with. Firstly, it needs to remain out of view. Hiding this practical component is aesthetically desirable but creates other problems because the only place to hide it is behind the wall.

Which brings us to the second issue – removing the liquid once it has been spent. The best option, and by far the most aesthetically pleasing, is to re-cycle the nutrient back through the vertical garden. This can be achieved either through pumps or gravity fed suction and makes the whole project more manageable and less intensive.

Another point worth considering if you plan to introduce an indoor vertical garden into your living room is the issue of moisture. Keeping constant liquid running down the inside of your walls can only produce one thing – mold. So it pays to prepare the wall well with a mold-resistant paint or covering.

Once you’ve taken all the precautions there’s no reason to start working on your indoor project and as wall gardens go, vertical gardens are such a delight.