Rhubarb, round rhizome, cut, herbal tea. Rhubarb, round rhizome, cut, herbal tea. What is it? Rhubarb has a dual function, being both a food and a medicinal product. For the latter, the species is better known as Chinese rhubarb. The plant, which can reach up to two meters in height, lives in Europe and Asia in different species. Rhubarb, round rhizome, cut, herbal tea. What is it used for? Rhubarb is used for food purposes for the production of