It originates from East Asia and is a significant part of the diet in southern and central China and Japan. It is a very easily digestible vegetable that heals the mucous membranes of the digestive tract and supports kidney function. It is diuretic and clears heat in the stomach and lungs. It is suitable for gastric and duodenal ulcers, flatulence, constipation, and coughs. It is suitable for dry mouth and feelings of thirst.

It is a source of vitamins C and B, and contains potassium, magnesium, calcium, and iron.

It has a sweet taste and is neutral to slightly cooling in nature. It clears heat and supports digestion, and promotes the production of body fluids.