Jalapeño Pepper
Capsicum annuum — 2,500–8,000 SHU
The Jalapeño is the world's most popular chilli pepper — and for good reason. Medium heat, thick walls, and reliable production make it the perfect starting point for home growers. It thrives in containers, produces abundantly, and can be harvested green or left to ripen red for a sweeter, slightly hotter flavour.
🔥 Where does Jalapeño sit on the heat scale?
🌱 How to Grow Jalapeños
6–8 hours of direct sun daily. South-facing windowsill or outdoors in summer. More sun = more heat in the fruit.
Ideal 20–30°C during the day. Bring indoors below 15°C. Cold snaps cause flower drop and slow fruiting.
Consistent moisture is key. Water when top 2–3 cm is dry. Let drought stress slightly once fruit appears — it boosts heat.
Well-draining compost mix in a 10–15L pot. Good drainage holes are essential — Jalapeños hate wet feet.
High nitrogen early for leaf growth, then switch to potassium/phosphorus feed once flowering begins. Avoid excess nitrogen during fruiting.
Pinch the growing tip when the plant is 20–25 cm tall to encourage bushy growth and more fruiting branches.
🩺 Common Jalapeño Problems
Cause: Temperature stress, low humidity, or over-feeding nitrogen
Fix: Keep temps 20–30°C, mist occasionally, reduce nitrogen feed
Cause: Overwatering, poor drainage, or nitrogen deficiency
Fix: Check soil moisture before watering, ensure drainage holes are clear
Cause: Insufficient pollination (indoors), temperature too high or low
Fix: Shake plants gently to simulate wind pollination, or use a soft brush
Cause: Common on young growth, especially indoors
Fix: Blast off with water, apply neem oil spray weekly until clear
Cause: Calcium deficiency caused by irregular watering
Fix: Water consistently, add crushed eggshells or calcium supplement to soil
Common Jalapeño Questions
How hot is a Jalapeño?
2,500–8,000 SHU — medium heat. Noticeable spice, but manageable. Drought or heat stress pushes them toward the hotter end.
When should I harvest Jalapeños?
Harvest green at 70–80 days for that classic flavour, or leave to ripen red (85–90 days) for sweeter, slightly hotter fruit.
Why are my Jalapeño flowers dropping?
Usually temperature stress (below 15°C or above 35°C), low humidity, or too much nitrogen. Stabilise conditions and cut back on nitrogen feed.
How do I make Jalapeños hotter?
Stress the plant intentionally — reduce watering once fruit appears, maximise sun, and avoid over-feeding. Mild drought concentrates capsaicin.
