An arboretum is defined as living collection of trees and other woody plants. More commonly today, an arboretum is a botanical garden containing living collections of woody plants intended at least partly for scientific study , Various tree species of native and exotics are grown in the Arboretum.

The arboretum, maintained by the department of horticulture is situated near the lake. It was started in the year 1992 with the aim of introducing exotic tree species and studying their performance. Alnus nepalensis, Callistemon, Lanceolatus, Cupressus macrocarpa, Eugenia apiculata, Hypericum hookerianum, Poocarpus elongate, Populus deltodes, Quercus macrocerpa, Salix babylonica, Taxodum mucronatum, Prunus pissodii are few species found here. It is located near the bus stand.