Rhubarb, Rheum x coltorum is available in many cultivars (named hybrid varieties). One important characteristic of the different cultivars is the stalk color which can range from red to green. In between colors are often called pink or speckled.
A deep red petiole is the more popular among consumers, but these plants are often accompanied by poor growth and yield. Green varieties are often much more productive. Consumers also often assume the red stemmed rhubarb is sweeter than other colors but color and sweetness are not necessarily related. The Victoria variety, which is probably the greenest variety, can produce some very sweet stems.