On the whole Woolly Pockets are a great product but Vertical Garden Online does have reservations about its use indoors. The Woolly Pocket Company maintains that Wallys are designed for indoor use. We tend to disagree. People need to be mindful that these products were designed and tested in an arid environment – Arizona USA.
Of course mould can be avoided by reducing the amount of water made available to the vertical garden but its sensible to be aware that mould can grow if the conditions are right.
The best way to protect the walls is by either applying a waterproof paint or creating a timber frame to sit between the vertical garden and the wall. The first option is kind of like ‘tanking’ a bathroom. Most hardware or paint shops can assist with a suitable product. The other technique (build a timber rail system to the wall and attach the vertical garden to the timber) allows the wall to breathe.