...hard to believe? It's true ~ facade greening can dry your damp walls! While it won't replace professional, modern building drying, it certainly helps. The walls of old farmhouses were at least always halfway dry as long as vine or fruit trees on the house walls prospered. For every kilo of dry plant matter, 500 liters of water are needed. We already know that a vine/tree will dry the ground searching for water, so... put that green on the wall and let it pull water from there! Take this into account when renovating an old building!