Serrano Seeds
Bright Green Crunch

Serrano Chilli Seeds

Serrano Chilli Seeds

Sleek, green, mild crunchy heat: Heat Level: ★ ☆ ☆ ☆ ☆

The Serrano is one of Mexico’s most important chillies, and growing it from seed gives you exactly what makes it so central to the cuisine: clean, bright heat and that unmistakable sharp, green flavour that lifts salsas.

Pods are slim, firm and typically 3–5 cm long, ripening from a deep grassy green to a glossy red. Most recipes call for them green, where the flavour is fresh and direct, but the ripe red pods bring a slightly sweeter edge if you leave them to mature.

Plants from seed are naturally upright and busy, setting fruit continuously once they get going. They handle UK conditions well with protection, and because the pods mature reasonably quickly, they’re a reliable mid-season producer.

Heat sits in the 10,000–25,000 SHU range — hotter than a Jalapeño but still very much in everyday-cooking territory. Perfect for salsa verde, pico de gallo, or anything that needs a clean, bright kick without tipping into superhot territory.

If you like chillies that actually taste of something — not just heat — the Serrano earns its place.

Find out more about the Serrano in Chilli of the Week.

If you’d rather skip the seed stage, I also grow Serrano plug plants, ready to pot on and get going quickly.

Additional Information

▶ Packet Contents: Ten seeds per packet.

▶ Species: Capsicum annuum

▶ Heat Level: Typically 10,000–25,000 SHU

▶ Germination: 10–21 days at 24–28°C

▶ Seedling Growth: Quick, with early upright structure and strong stems

▶ Plant Habit: Bushy plants around 60–90 cm, continuous setting of slim pods

▶ Fruit Appearance: 3–5 cm cylindrical pods, maturing green to red

▶ Flavour Profile: Fresh, sharp, grassy heat; sweeter when fully ripe

▶ Growing Conditions: Warm, bright position; performs well in containers or sheltered beds

▶ Time to Harvest: Approximately 75–100 days from sowing

▶ Origin: Central Mexico, especially Puebla and Hidalgo

▶ How to Grow Chillies: Includes my free 28-page booklet “How to Grow Chillies” with every seed order

Coir Blocks

Classic Hots

Record-breakers

Cooks' Collection

World of Chillies was set up by Sarah Hunt in 2011 to promote chilli growing and the enjoyment of everything hot and spicy.

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▶ 1. Easy to Grow: Some chillies are just a joy to grow — compact, reliable, and happy in a pot (5). Others shoot off in all directions or sulk at the first sign of wind (1). I’ve given higher scores to the ones that do well here in the UK.

▶ 2. Ornamental Quality: A few of these are real show-offs, with pods that look like jewels or dramatic foliage that turns heads. Others are more practical than pretty. This score is just about how good they look on the patio or in the greenhouse.

▶ 3. Heat Level: This isn’t a technical SHU score — it’s just a kitchen-friendly 1 to 5. A 1 means very mild (like a jalapeño), a 5 is properly hot (think Bhut Jolokia). It should help you judge what you’re in for!

▶ 4. Hardiness: How well do they cope with our unpredictable summers? I’ve given higher scores to the tough ones that keep going through cool nights, wind, or patchy weather without much fuss.

▶ 5. Culinary Use: This one’s about how often I actually use them. Some are perfect for pickling, stuffing or powders — others look good but don’t end up in many meals. If it’s flavourful and versatile, it scores high.

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