Food production on greening of roofs and façades

F. Demling
The world population development and urbanisation let more and more people ask about their food production. Urban gardening projects are an option to show how vegetables grow and can be a chance for local supply. But often it is difficult to get a plot of the expensive land. The Bavarian State Institute for Viticulture and Horticulture in Veitshöchheim, Germany, researches food production on extensive green roofs and living wall systems since 2014. In different tests vegetables were grown on roof models (24 plots, each about 4 m2) and former extensive green roofs (each about 50-100 m2). All areas were built like a typical one-layer green roof according to FLL-guideline (FLL, 2008). Mostly substrate got watered by drip irrigation and fertilised with granulated minerals adapted to the nutritional requirements. The yield and the vitality of all plants were observed. For an ecological improvement some variants were cultivated in a water circuit. Four different Living Wall systems (each about 6 m2) were tested on a wall in Veitshöchheim. The systems had substrate, geomembrane and water for growing media. Each system had an own circuit for irrigation and fertilisation. If vegetable plants get enough water and nutrients most types can grow good on buildings.
Demling, F. (2018). Food production on greening of roofs and façades. Acta Hortic. 1215, 171-174
DOI: 10.17660/ActaHortic.2018.1215.32
urban gardening, rooftop farming, green buildings, vegetables, living walls, soilless systems

Acta Horticulturae