Source: photograph by volunteer
Rockworks (see History and Guide 2009 p 34) became very popular in Victorian gardens, with manuals giving instructions about how to build them using limestone and clinker waste from furnaces or gasworks. A large piece of clinker can be seen at the top of the ‘steps’ here, down which water could trickle to be absorbed in the flower bed below.
In recent years ferns have been planted in the twenty or so planting holes built into the face of this long retaining wall. See also PGPT016,081,214.