Sedum are succulents commonly known as stonecrops. The wild, yellow flowered variety found growing wild in the UK is a plant that I became familiar with when growing up in the Yorkshire Dales. There it favoured old walls where it would thrive as it tenaciously gripped the surface and added colour to the dry, infertile conditions. In Lincolnshire I frequently saw it growing in the debris that gathered in the hollows of pantiles on the roofs of old agricultural buildings. The cultivated sedums in this photograph at Beth Chatto's garden near Colchester have been planted in pebbles by someone with an artist's eye and make a fine abstract composition.
photo © T. Boughen Camera: Olympus OMD E-M10 2017