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How Many Hours of Sunlight Does a Jalapeno Need?

By Beth Asher
Jalapenos are a medium-hot culinary pepper.
JALAPENO PEPPERS image by brelsbil from Fotolia.com

Peppers are described as sweet (bell) or hot (jalapenos). Pepper heat is rated in Scoville units, named after the man who developed a way to test their hotness. Jalapenos actually rate low on the heat scale.

Light During Germination

Hot chile types like jalapenos need light for germination. A strong light source will increase the number of seeds that germinate.

Day Length

Sun-loving jalapenos need long days to set fruit.
baby Jalapeno chilli pepper plants in nature image by Elena Moiseeva from Fotolia.com

Jalapenos are sun-lovers that need long days to set fruit. Locate them in a spot in the garden where they get full sun.

Sunlight Hours

Jalapenos need eight to 12 hours of sunlight to flower and set peppers.
chiliblüte image by Anja Langner from Fotolia.com

Jalapenos need long hours of sunlight to grow and prefer a southern exposure where soil warms up quickly. They need at least six hours of sun per day to grow properly. “They flower and set fruit best when days are eight to 12 hours long,” advises Doug Dudgeon of Brooklyn Botanical Garden.


Where summers are extreme, peppers benefit from afternoon shade.
floriculture image by martini from Fotolia.com

Even though jalapenos need at least six hours of sunlight daily, they are susceptible to sunscald. “The heat of the sun may burn the side of the fruit exposed,” warns Eldon Everhart of Iowa State University’s Extension. If you live where there are extreme high temperatures, peppers will require some afternoon shade.

Greenhouse Light Requirements

Greenhouse jalapenos need 13 to 16 hours of light.
Metal greenhouse in summer with open door image by Scott Latham from Fotolia.com

Jalapenos can be grown entirely in the greenhouse or raised to transplant size. Greenhouse-grown jalapenos require at least 13 hours of light and 16 hours of light is ideal.


About the Author


Beth Asher began writing in 1972 for a catalog company. She has written for schools and charities, including Star Workshop Foundation. She was a John Deere representative for nine years, manager of Brown's Blueberries and an advisory member of King County Small Farms Board and the Washington Association of Landscape Professionals. Asher holds a Bachelor of Science in computer networking from City University.