The Serrano Pepper is a type of chili pepper. It is similar to the jalapeño in its look, but this pepper is much hotter. On the Scoville heat index, the serrano pepper can be between 10,000 and 25,000. This great tasting pepper variety is pungent that can grow up to 4″ long! These skinny peppers have medium thin walls that mature to a bright red color. Culture: Start indoors a month before last frost date and transplant to fertile well tilled soil 18″–24″ (45–60 cm) apart. Harvest: 80 days. Uses: Adds zest to sauces, salads, soups, stews, dip and dried seasoning.