Siemer, Youri, Hans Kruse, Marco Roos, Dirk Roosendaal, and Koos Biesmeijer. “Optimising Green Roofs in the Netherlands: Effects of Mineral Wool and Compost Additions on Flowering Success”. Sibbaldia: the International Journal of Botanic Garden Horticulture 25 (September 3, 2026). Accessed September 15, 2026. https://journals.rbge.org.uk/rbgesib/article/view/3634.