There are multitudes of reasons how invasive species was introduced in India and in various parts of the world. In the Nilgiris region, most of them were brought as ornamental plants during the British period and their presence has become overwhelming and detrimental to the natural and endemic flora and fauna.

These invasive species have become a growing concern in the Nilgiris Biosphere Reserve and poses a great threat to the local ecosystem, its functions and affects the biodiversity present in the region. Some are a major threat to the native vegetation as they proliferate, which in turn causes less fodder for the herbivores that results in loss of habitat, some are considered to have a negative effect on one’s health and in some cases, they are proved to cause conflicts between man and wildlife.

Keystone Foundation, in collaboration with Ashoka Trust for Research in Ecology and the Environment (ATREE) and World Wildlife Fund for Nature –India, has proposed to undertake a participatory appraisal of the status of invasive alien species of the Nilgiris watershed region, curb the damage caused and to create an atlas of the foreign flora and fauna spread over the hills.