Rhubarb: fleshy, red, edible stalks (petioles) of species and hybrids (culinary rhubarb) of Rheum in the family Polygonaceae, which are cooked and used for pies and desserts.
It’s known as a vegetable, produces stalks that are considered a fruit, and it has been known for centuries as a medicinal herb.
A herbaceous perennial that grows from short, thick rhizomes. It grows best in full sun (with some afternoon shade) but will tolerate partial shade. Choose a site with soil that is well-draining and fertile.