Growing Walls


This is an interesting and very practical idea developed by Gösta Nilsson, the Director of Sanitas in Botswana. He has developed a container gardening system based on walls with built-in growing boxes, made of hollow concrete blocks. The blocks are made using a simple, hand-operated block-making machine. With such a machine, two persons can make 100 blocks a day from a mix of 1 part cement and 4 parts sand. This is the size block which is used at Sanitas, but blocks of similar size would be fine...