Sikkim Sundari: The rare Himalayan flower that waits decades to bloom Meet Sikkim Sundari (Sikkim Rhubarb), one of the rarest Himalayan flowers that blooms only once in decades. Scientifically known as Rheum nobile, this extraordinary plant grows at extreme altitudes of 4,000–4,800 metres in the Eastern Himalayas, including Sikkim, eastern Nepal and southeast Tibet. Often called the “Glasshouse Plant”, Sikkim Sundari survives freezing temperatures and intense UV radiation by forming a natural gr