Rangers from Plym Valley have been working on the vegetation survey in the Upper Plym. Eleven two hectare plots are surveyed each year using an adaption of the Natural England Grazing Index. The survey comprises three parts which include grass to dwarf shrub ratio, percentage dwarf shrub cover and indications of heavy grazing on heather.
The surveys, which were carried out in typical Dartmoor weather, have been carried out for over ten years and are used to identify the condition of moorland vegetation. They are also used to assess the effect of animal grazing in sample areas.