Mitcham Common is 182 hectares (460 acres) of common land situated in south London. It is predominantly in the London borough of Merton, with parts straddling the borders of Croydon and Sutton. It is designated a Site of Metropolitan Importance for Nature Conservation.
These works reached such a proportion that public opposition, led by George Parker Bidder QC, culminated in the protection of the common by a scheme under the Metropolitan Commons Act 1866, confirmed by the (54 & 55 Vict. c. xxvi). The cost of its maintenance was split between the parish councils of Mitcham, Beddington and Wallington, and the council of the county borough of Croydon, according to the proportion of the common within each parish boundary.
Mitcham, now part of the London Borough of Merton bears the majority of the costs, with the remainder going to the London Boroughs of Croydon and Sutton. These funds support a warden and three assistants. Each council is represented by four nominated members of The Board, elected every two years.
In the late 19th Century these practices ceased and woodland was allowed to regenerate. This process allowed a succession from grassland, through a series of intermediate stages, to woodland.
The river gravels are well drained and strongly acidic, leading to a hostile environment in which plants have to withstand occasional drought and nutrient deficiency. However, considerable areas have acquired foreign during landfill programmes, whilst ploughing for agriculture during World War II and numerous pipe laying programmes have brought trapped nutrients to the surface. The result is a patchwork of soil types, each providing different plant and animal habitats. As the grassland reverts to woodland, the various stages in this process create further habitats.
The Seven Islands pond is the largest of the ponds on the common, and was created as the result of gravel extraction during the 19th century. The most recent pond to be created, Bidder's pond, was created in 1990 and named for George Parker Bidder.
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