Scoville Heat Units: 10,000 - 23,000 SHU The serrano chili pepper is a quite a bit like the well known jalapeño pepper, similar in color, but smaller, about 1 to 4 inches long on average and 1/2 inch wide. They generally grow between 1 - 4 inches long and about 1/2 inch wide though they have … Continue reading Serrano Peppers