Badgeworth SSSI (grid reference SO 911206) is a 3.08-hectare (7.6-acre) biological Site of Special Scientific Interest in Gloucestershire notified in 1954 and renotified in 1983.

[1][2] Part of this site (grid reference SO910206) is owned and managed by the Gloucestershire Wildlife Trust as a nature reserve.

[5] The site is a depression on Blue Lias clay, which fills seasonally with rain water and run-off from adjoining pasture to create the wetland habitat which is needed for the plant.

In 1964 an entry in the Guinness Book of Records described Badgeworth as the world's smallest nature reserve.

A local management committee was formed and the area was fenced, gated and walkways created over the wet ground.

Its root system consists of long branched fibres which spread in whorls from the lower joints of the stem.

Common Frogs and Great Crested, Smooth and Palmate newts breed in the ponds.

Sections of dense growth of Reed Sweet-grass and Creeping Bent are removed in the autumn to create areas of bare soil necessary for germination of Adder's tongue Spearwort.

There is a potential risk of a catastrophic event wiping out this isolated population of Adder's-tongue Spearwort with the gradual encroachment of Cheltenham's boundaries.