Sedum roofs can be afflicted by weeds in wet weather, but only buddleia can survive heatwave

In theory green roofs that are planted with sedums require no maintenance. The growing medium, described as substrate rather than soil, looks like lumpy brick dust that seems too impoverished to sustain anything. Sedums are succulents, however, and thrive in such conditions, especially without competition from other plants.

Related: Lia Leendertz on sedum roofs and tiny gardens

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Read More Weatherwatch: sedum roofs doing well in heatwave

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