Ceterach officinarum is a fern in the Aspleniaceae that favours dry, rocky, calcareous locations and is commonly planted in walls and crevices. It prefers partial shade on north or east aspects and tolerates dry to moderate soil moisture. Give it well‑drained alkaline substrate and a sheltered position. In UK conditions it is fully hardy.

Rustyback Fern (Ceterach officinarum) is a fern for walls, rock gardens and crevices that prefers partial shade and alkaline, well‑drained soils.

https://en.wikipedia.org/wiki/Asplenium_ceterach

Asplenium is a genus of about 700 species of ferns, often treated as the only genus in the family Aspleniaceae, though other authors consider Hymenasplenium separate, based on molecular phylogenetic analysis of DNA sequences, a different chromosome count, and structural differences in the rhizomes. The type species for the genus is Asplenium marinum.

Ceterach officinarum

Rustyback fern | Ceterach officinarum

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