The serrano pepper (Capsicum annuum) is a type of chilli pepper that originated in the mountainous regions of the Mexican states of Puebla and Hidalgo.The name of the pepper is a reference to the mountains of these regions.Mature serrano pepper plants reach a height of 46-150cm (1½-5ft) tall.Each plant can hold up to fifty pepper pods. Unripe serrano peppers are green, but the color at maturity varies. Common colors are green, red, brown, orange, or yellow.The serrano pepper's Scoville rating is 10,000 to 25,000. Their flavor is crisp, bright, and biting, notably hotter than the jalapeño pepper they resemble, and they are typically eaten raw.