Resumen de Composition and depth of Extensive Green Roof substrate affect the growth of two Mediterranean plant species under different irrigation conditions

Sara Ondoño, Javier Martínez Trufero, J.L. Moreno

• Recently, the design of new substrates capable of sustain an adequate plant development in Green Roof systems under Mediterranean climatic conditions is a challenge due to the unfavorable hot and dry conditions. The use of suitable lightweight substrates which can promote an adequate plant growth and maintenance over time is an important achievement as well as the plant species selection. The most commonly used plants in Green Roof systems are the Crassulacean since they are perfectly fitted to drought conditions. In this sense, the use of herbaceous and shrub endemic Mediterranean species could provide an added value in green roof designing under semi‐arid conditions. Therefore, we aim to evaluate the growth of two endemic species (Silene vulgaris (Moench) Garcke and Lagurus ovatus L.) in two different substrate types with two different depths. To be precise, one substrate was made of a mixture of compost and crushed bricks (CB) (1:4; v:v), and the other one was made of ...