One of the famous botanical garden in sri lanka is

Royal Botanical Gardens Peradeniya.

This gardens are located at about 5.4 kilometers from Kandy, the capital of Central Province, near Mahaweli river.Adjecent to the garden is the National Herbarium of Sri Lanka. The land used by the garden is more than 145 acres, containing more than 4000 species of plants. Number of variety of orchids, plants of spices, palm trees and medicinal plants are grown in this garden. During the period when ancient sinhales kings like King Wickramabahu ruled the country, he had kept his court in this site. The garden was gradually expanded after 1843.

Another botanical garden situated in Nuwaraeliya district is

 Hakgala Botanical Garden

It is situated at a distance of 16 kilometers from Nuwaraeliya. The garden was started after the year 1860 but it was establisted as a botanical garden in the year 1884. More tourists are attracted due to the deferent varieties of orchids and roses found in this garden.