
The origins of the Botanic Gardens dates as far back as 1371 when King Wickramabahu III ascended the throne and kept court at Peradeniya near Mahaweli river this was followed by King Kirti Sri and King Rajadhi Rajasinghe. A temple was build on this location by King Wimala Dharma but it was destroyed by the British when they were given control over the Kandyan Kingdom. There after the ground work for a Botanical Garden were formed by Mr Alexandar Moon in 1821. Botanical Garden at Peradeniya were formally established and plants from Kew Garden at Slave island, Colombo and from the Kalutara Garden in Kalutara were moved up until 1843. The Royal Botanic Gardens, Peradeniya was made more independent and expanded under Mr George Gardner as its superintendent in 1844. The gardens came under the administration of the Department of Agriculture when it was established in 1912.
The Classical Avenue of Palms is located in this Garden. One tree with a significant history is the Cannon ball Tree planted by King George V of the United Kingdom and Queen Mary in 1901. The tree is bent with its fruits which looks like Cannon Ball, which is how it came to be named.
It also used during the Second World War by Lord Louis Mountbatten, the supreme commander of the allied forces in the South Asia as the headquarters of the South East Asia Command.

This beautiful garden has some 62 hectares in extent and located at an altitude of 550 metres. Peradeniya takes its name from pera (guava) and deniya (plain), which would suggest an early connection with the introduction or the cultivation of fruits, as the guava is not indigenous to the island. The site was originally the royal pleasure gardens of King Kirthi Sri Rajasinghe (1747-1780) of Kandy.
Efforts were made to establish a botanic garden in the island, first by the Dutch at Slave Colombo, and then by the British at Kalutara in 1813, before the final transfer to Peradeniya in 1821. Initially, western fruits and vegetables were grown here, then exotic crops such as coffee, tea, nutmeg, rubber and cinchona, all of which later became important to the island’s economy.

The scope was expanded, however, to include all of Sri Lanka’s flora, and representative species from all over the tropical world. In fact the gardens main attraction today is the 50-acre (20-hectare) arboretum of some 10,000 trees, including a palm garden illustrating the variety of this particular species. In addition, there is an impressive and graceful avenue of royal palms, planted in 1905.

Massive bamboos thrive along the banks of the Mahaweli, including the largest species, the Giant Bamboo of Burma, which can grow as much as 2 feet (60 centimeters) in a single day. Another remarkable feature is the enormous Java fig tree that sprawls across the main lawn, its long branches judiciously propped up in many places. There is also a herb garden, where herbs used in Ayurvedic medicine are grown, and a most important orchid house that reflects the amazing variety of species to be found in Sri Lanka.