The Serrano chilli plant is a Mexican classic for anyone after a fresh, clean heat. The slender fruit is often used green, but can also fully ripen red. Botanically, Serrano belongs to Capsicum annuum; the fruit grows about 4–7 cm long and stays pleasantly crisp.
How hot is Serrano chilli?
Serrano sits at around 10,000–23,000 Scoville Heat Units (SHU). That makes it noticeably hotter than many jalapeños, while staying well below habanero and superhot level. This Scoville range places it in the medium-hot chilli plants with heat level 4–7 category.
Serrano or jalapeño?
Both varieties come from Mexico and are often harvested green. Serrano is slimmer, smaller and noticeably hotter. The Jalapeño chilli plant, on the other hand, produces thicker fruit that is great for stuffing. Growing both lets you fine-tune the heat in your cooking.
Using Serrano fresh
Its crisp flesh and fresh aroma pair wonderfully with guacamole, tacos, ceviche, pickled vegetables and finely chopped garnishes. Green, Serrano tastes especially fresh and sharp; fully ripe red, it's a little rounder.
Growing Serrano in a pot
Serrano is less demanding than many late-ripening superhots and thrives in a pot, on the patio, in a greenhouse or in a warm spot in the garden. Choose a full-sun, sheltered position and plan for at least 8, ideally 10 litres of pot volume, or more if you have the space. The plant grows about 60–90 cm tall, branches well and sets plenty of fruit in warm conditions. You'll find tips on watering and feeding in our chilli plant care guide.
From the Serrano plant to hot sauce
We grow Serrano ourselves in Illmitz and use the variety in our own SerRacha too. Serrano also works very well for your own fermented or cooked chilli sauces. You'll find more classic species for growing yourself among our Capsicum annuum chilli plants.