Comparative Evaluation of <i>Crithmum maritimum</i> and <i>Origanum dictamnus</i> Cultivation on an Extensive Urban Green Roof
2025
Aikaterini N. Martini | Maria Papafotiou
Considering that urban horticulture benefits from green roof technology, the effects of substrate type (compost-perlite-pumice 3:3:4, <i>v/v</i> and compost-perlite-pumice-soil 3:3:2:2, <i>v</i>/<i>v</i>) and depth (7.5 cm and 15 cm) were comparatively evaluated in the cultivation of <i>Crithmum maritimum</i> and <i>Origanum dictamnus</i> on an urban green roof in modules that included a green roof infrastructure layering. During the first cultivation period (December 2015–August 2016), plants of <i>C. maritimum</i> were taller and had greater diameter than those of <i>O. dictamnus</i>. Greater fresh and dry weights of all plant parts were observed in <i>C. maritimum</i>, as well as in the deep substrates compared to the shallow ones. During the second cultivation period (September 2016–August 2017), the growth of <i>O. dictamnus</i> surpassed that of <i>C. maritimum</i>, while plant height and foliage diameter, as well as the fresh and dry weight of all plant parts were greater in the deep substrates for both species. Conclusively, both species grew satisfactorily on an extensive urban Mediterranean green roof, while the deep substrate favored all their growth parameters. <i>O. dictamnus</i> responded better in the soil-containing substrate regarding survival, growth, and flowering, as opposed to <i>C. maritimum</i> that showed equal response in both substrate types.
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