Purwell Ninesprings is a 6.4-hectare nature reserve managed by the Herts and Middlesex Wildlife Trust on the edge of Hitchin, Hertfordshire, England.

Carex stricta is a species of sedge known by the common names upright sedge and tussock sedge. The plant grows in moist marshes, forests and alongside bodies of water. It grows up to 2 feet tall and 2