evidence: An image is being shared widely on Facebook with the claim that it shows Mahameru flower that blooms once every 400 years in the Himalayas. Let’s check the authenticity of that claim. Claim: Image of Mahameru flower that blooms once every 400 years in the Himalayas. Fact: The plant in the image is ‘Rheum Nobile/ Sikkim Rhubarb/Noble Rhubarb’, it blooms every year in the Himalayas. So, the claim is FALSE.