Arboretum is an exclusive zone for conservation of tree species. It has about 400 individual mature trees belongs to 250 species including Rare Endemic and Threatened species of South Western Ghats. The main attractions of arboretum are Eugenia argentea (a tree endemic to Nilgiri region of South Western Ghats, which had presumed to be extinct but found after140 years. It’s been conserved at MSSBG),
 Miliusa wayanadica & Miliusa gokhalaei, Memecylon clarkeanum (an endemic and threatened species of Sri Lanka and a new record of India). The arboretum also serves as an ecological niche for animals.