This spicy little pepper, commonly thought of as a vegetable, is actually a type of fruit! Named after the town of Jalapa, Mexico, the jalapeño has garnered immense popularity outside of Mexico and is the most commonly consumed pepper within the US. Accustomed to hot, dry climates, jalapeños are a relatively versatile crop that will grow in most climate zones. Normally picked while they are still young and green, jalapeños will take on a beautiful, vibrant red color if allowed to mature. Levels of spice for these fruits will vary based on how much stress they endure. If grown in more difficult environments and allowed to stay on the stem longer, the level of heat tends to go up, so be sure to pamper your plant if you prefer milder flavors!
As you might have guessed, the Purple Jalapeño variety produces purple peppers (try saying that 5 times fast!) as well as lovely purple flowers and lightly purple-tinged leaves. Although the peppers of this plant will stay in the purple stage of growth for quite some time, they’ll eventually change to red in color when fully mature. While this variety is classified within the same range of heat as other jalapeños on the Scoville scale (2500-8000 SHU), its peppers tend to frequently land on the higher end, so keep that in mind to avoid an unpleasant spicy surprise!
Seed Depth: 1/4″
Space Between Plants: 12–18″
Space Between Rows: 3′
Germination Soil Temperature: 65–80°F
Days for Germination: 10–25
Sow Indoors: 6 to 8 weeks before average last frost. In USDA Zones with warmer climates, such as 9–10, you can also sow in late summer for a fall/winter crop. Sow in soil or germinating medium, such as rock wool.
Sow Outdoors: 2 to 4 weeks after all fears of frost have passed. Outside temperatures must be at least 70°F and soil temperature at least 65°F.
Vegetative: Peppers can be propagated/cloned from stem cuttings but are most commonly grown from seed.
Thrives in environments with warmer daytime temperatures and cool, humid nights. Zones 8 and above are suggested for most suitable outdoor growing conditions. That being said, the pepper plant will not produce an abundance of fruit when temperatures are over 90˚F.
Natural: It’s best to supply your jalapeño with a source of shelter that provides a mixture of full sun and partial shade. Areas of intense, all-day sun will not be valuable places to plant your jalapeño.
Artificial: 14–16 hours of light under a fluorescent or HID lamp will be sufficient for growing peppers indoors. Total darkness, or night periods, are required to induce flowering and therefore fruiting.
Soil: Prefers loamy soil with a slightly acidic pH of 6.0-6.8. Drainage is very important with this pepper, as they are susceptible to root rot in heavy clay soil, and root systems will not thrive in sandy soils. Peppers do not like salt, so areas near oceans or beaches may not be ideal.
Soilless: Does well in clay pellets that allow good drainage.
hydroponics: Thrives in hydroponic systems, especially deep water culture.
Aeroponics: Thrives in aeroponic systems. Due to the fact that peppers enjoy good drainage to avoid rotting, they do not like to have dry feet. Aeroponics is a superb way to grow peppers to keep them at a constant state of average moistness and nutrient availability.
Water: Peppers like wet roots but need to become dry between watering. They can’t stand to be waterlogged, so an even watering at the soil level 1–2 times per week will be sufficient. Watering is especially important during the fruiting process, so when flowering beings, increase your waterings to 2–3 times per week until maturity.
Nutrients: Add compost or manure to increase nutrient availability and aid in drainage when planting or transplanting. Additions of phosphorus and potassium will aid in flower and fruit production, but over-fertilization can be devastating, so watch out!
Foliar: A bio-activator, such as kelp or seaweed, applied a few times during its growing season may contribute to growth and development.
Pruning: To promote wider and bushier growth that provides more area for flowering and fruiting to occur, pinch off a few of the new growth tips when about 6–8″ tall.
Mulching: Mulching will maintain a soil warmth that is necessary for your jalapeño as well as offer a beneficial blockage of excess weed growth.
Other: Proper air circulation is key. If outdoors, space plants about a square foot apart in areas that are not blocked or surrounded by dense brush to encourage air flow. If indoors, install fans.
Note: transplant shock is common in pepper plants. Transplant in the evening in well-tilled, fertilized, moist warm soil to lower losses.
Deficiency(s): Phosphorus deficiency in the jalapeño will cause stunted and reduced yields of fruit.
Rotation: Crop rotation, although not mandatory, can be beneficial to reduce excessive growth of soil parasites.
Companions: Marigolds make an excellent companion to the jalapeño, as their roots deter damaging pests such as nematodes. Also grows well with basil, oregano, parsley, and rosemary, all of which deter pests and insects. Other companions include tomatoes, green peppers, eggplants, and okra (all close relatives to the jalapeño in the Solanaceae family). Avoid planting with members of the Brassica family.
Harvest: You may want to harvest Purple Jalapeños slightly before full maturity in order to grab some peppers that have that rich, deep purple color; otherwise, wait until the peppers have turned red as a sign of their full maturity. You can also tell when peppers are ripe because they will easily pluck off from the plant. If you are pulling the fruit and the plant tugs with you, peppers are not ready to harvest. Small cracks near the top of the fruit will indicate proper ripeness. You should plan to harvest your jalapeños in 3–4 months time from transplanting a seedling.
Storage: The best way to store your fresh jalapeño peppers is to put them in a container in the fridge.
Helpful Hint: Although there’s no full-proof way to check for a pepper’s heat without tasting it, “stretch marks” are usually a good indicator. These stretch marks are actually called striations and indicate that a jalapeño is further along in development than those without, which indicates a more developed level of heat.
Preserve: Jalapeños can be dried, pickled, canned, or frozen. See Helpful Links for specific ideas.
Prepare: Mexican cuisine often utilizes the jalapeño. Freshly sliced or pickled peppers are added as a garnish or ingredient in many dishes such as sopes, tacos, and nachos. Chopped jalapeños make a great and exciting addition to any salsa or guacamole. Chipotles are made from smoking fresh jalapeños. They are often stuffed with cheese and served as a yummy appetizer. The Vietnamese serve freshly-sliced jalapeño alongside other dressings for their delicious brothy soup known as Phở.
Nutritional: Peppers are a natural source of vitamin(s) A and C.
Medicinal: Capsaicin, the phytochemical responsible for the ‘hotness’ in peppers, has shown many valuable qualities in the medicinal world. Capsaicin is most commonly seen on the medical market as a topical ointment that relieves minor pains associated with muscles and joints. More recently, the effects of capsaicin have been effectively used against the pain associated with neuralgia and fibromyalgia.
Warnings: Jalapeños’ capsaicin content is irritating: do not touch eyes or rub on areas of sensitive skin. Wash hands before using the bathroom please!
For a fresh, spicy snack try this easy Pico De Gallo recipe. The directions to keep it chunky instead of blended will allow the color of your beautiful jalapeños to shine through!