In Conjunction with Munro and H. G. Turner of the Madras Civil Service was founded the North Travancore Land Planting and Agricultural Society, whose members developed their own estates in various parts of the High Ranges. This first cultivation was undertaken by A. W. Turner near Devikulam lake in 1877. The pioneers tried many crops such as coffee, cinchona, sisal and cardamom before discovering tea, the product best suited to the area.The first tea plant was planted by A. H. Sharp at Parvathi, now in Sevenmullay estate, but then a 20 hectares (50 acres) clearing in an immense jungle. In 1893-95, the concession area was purchased by Muir and Co. which later became James Finlay & Co. Ltd.

The Duke of Wellington is reputed to have been the first European visitor to Munnar, in 1790, but this is unlikely. In the early 19th century, the headman of the villages of Anchanad, just to the North of the high ranges was named Kanan Thevar. It is said that travelers from Madurai to the West coast passed through these villages and named these hills after him.  An entry in the diary of Madras army Lieutenant made in 1817 describes a bullock-road heading across the Kanan Devan hills into Coimbatore. In 1877-79, the Poonjar Chief, a subordinate prince to the Maharaja of Travancore, leased a large tract of land comprising 588 sq. km. to a lawyer in the employee of the Travancore Government named J. D. Munro. This tract, henceforth called the Kanan Devan Concession Land, was completely undeveloped, largely unexplored, and covered with thick jungle full of wild elephants and tigers.