Autumn Production of Romaine Lettuce on an Extensive Green Roof

Urban Farm DB summary

This study evaluated the productivity of four Romaine lettuce cultivars grown to maturity in an 8 cm deep lightweight clay substrate on an extensive green roof during the autumn production seasons of 2012 and 2013. Lettuce productivity was improved by the addition of fertilizers, with fast-release fertilizer providing the greatest growth and productivity. However, abnormally cold growing conditions in autumn 2013 resulted in lower yields compared to 2012, highlighting the system's vulnerability to weather.