Environment Minister Prakash Javadekar said the 'vilayati kikar' is not an indigenous or a native tree of Delhi Ridge, "but it has adapted well in Delhi and has become a dominant species".
"It restricts regeneration of indigenous tree species of Aravalli Ridge. The Delhi Government is taking steps to plant the Ridge forest areas by indigenous species gradually replacing the 'vilayati kikar'," Javadekar said in a written reply.
He said such steps will gradually reduce expansion and regeneration of 'vilayati kikar', and help to maintain and improve the ecosystem of the Ridge.
Today large parts of the Ridge are covered by this species.
Apart from being an invasive species, its leaves do not decompose and discourage all of the undergrowth below it, Delhi Forest Department has said.