Askham Bog (SE5647/SE5748) is a small (46ha) valley mire just inside the York ring-road and 5km SW of York Minster. For its size, it is one of the most species-rich sites in Yorkshire (Fitter, 2019) and its survival in a peri-urban setting is remarkable. It has been known for 200 years for its exceptional flora and invertebrate fauna, including numerous nationally significant rarities, and was included in the original 'Rothschild list' of 1913 that outlined potential national nature reserves in Britain (Sands, 2012). More than 3000 species have been recorded from Askham Bog, over 5% of all UK non-microbial species. The site isanSSSI, owned and managed since 1946 by the Yorkshire Wildlife Trust, whose careful stewardship has seen a marked improvement in its ecological status.
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