There are over 30 species of rhododendrons in Sikkim. The majority of rhododendrons' species colonize in altitudes varying from 9000 to 14000 feet, although certain species even grow at around 16,000 feet. The route to Dzongri, the mountain paths to the Singalila range Varsey and the Yumthang valley in North Sikkim are covered with rhododendron shrubs and trees, almost exclusively. Flowering from May to August during this period the hillsides in these regions are a riot of colors. The species are preserved and nurtured in Shingba Rhododendron Sanctuary located in Yumthang valley in North Sikkim, Versay Rhododendron Sanctuary at West Sikkim and Kyanglosha Alpine Sanctuary in East Sikkim. 

This tour begins at Darjeeling with excursion to Shandakpur. After entering Sikkim a visit to Varsey Rhododendron Sanctuary, Pelling, Gangtok, Lachung, excursion to Shingba Rhododendron Sanctuary. This tour is specially designed for the in-depth study of rhododendrons in Sikkim. The species varies with the elevation. The blooming time also differs with the altitude as well as the climatic condition. The accommodations are usually in star rated hotels in the town areas and log huts and lodges in Sandakphu, Varsey and Lachung.