How Many Hours of Sunlight Does a Jalapeno Need?

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Jalapenos are a medium-hot culinary pepper.
Jalapenos are a medium-hot culinary pepper. (Image: 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.

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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

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

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

Sunlight Hours

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.

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

Sunscald

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.

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

Greenhouse Light Requirements

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.

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

References

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