There are various systems for DIY constructions with most requiring a compost-based system , he says , but homemade hydroponic systems can be made using plastic bottles . Green walls transform dreary urban spaces into vertical banks of color . As well as aesthetic benefits , vertical gardens may also improve air quality . New wall near congested Marylebone Road in London may reduce pollution .
Green walls transform dreary urban spaces into vertical banks of color . As well as aesthetic benefits , vertical gardens may also improve air quality . New wall near congested Marylebone Road in London may reduce pollution .