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How to Grow Hot Peppers

Peppers habaneros
Habanero peppers

Hot peppers are distinguished from sweet peppers simply by their pungency or hotness of flavor. There are thousands of hot pepper varieties in the world. (This is the case because peppers easily cross pollinate to produce new kinds.)

The hotness of a pepper is determined by number of blisterlike sacs of capsaicinoids on the interior wall of the pepper. Capsaicinoids are organic chemicals. The more sacs of capsaicinoids the hotter the pepper.

Hot peppers go by several names. Most commonly hot peppers are called chili peppers in the United States. ‘Chile’ is Spanish for pepper. In Mexico chile dulce is a sweet pepper, chile jalapeño is a jalapeño pepper. When the name chile first came to the United States it was used to mean different kinds of peppers in different parts of the country. In time, the spelling “chile” was eventually corrupted to “chili” and the term came to be commonly used to describe any pepper that was hot flavored.

Here’s how to get growing hot peppers:

Description. Hot peppers are tender perennials that are grown as annuals. Peppers grow on compact erect bushes usually 1½ to 2 feet (46-61 cm) tall, but they can grow taller. The fruit follows a single flower growing in the angle between the leaf and the stem. Hot peppers–also called chili peppers–vary in shape and color and include the bell-shaped pepper, the heart-shaped pimiento, the short and long podded yellow wax, the conical-shaped jalapeño, and the cayenne. Because peppers easily cross-pollinate there are thousands of different hot peppers. Hot peppers vary in hotness or pungency. The hotness of a pepper is determined by the number of blisterlike sacs of capsaicinoids (organic chemicals) on the interior wall of the pepper. The more sacs the greater the hotness of the pepper.

Yield. Plant 5 to 6 hot pepper plants per household member. Determine how you plan to use the hot peppers and plant varieties according to the hotness of the pepper desired. A single serrano pepper plant will produce 50 fruits.

Site. Grow peppers in full sun (at least 6 hours per day) in soil that is rich in organic matter, moisture retentive but well draining. Peppers prefer a soil pH of 6.0 to 6.8. If the pH is below 6.0 add limestone to the soil; if the pH is above 8.0 add peat moss to lower the pH. A safe bet is to always work aged garden compost into beds prior to planting. The optimal soil temperature for peppers is 65°F (18°C) or warmer. Choose a site protected from wind. Avoid planting in beds where other members of the Solanaceae family (peppers, eggplants, tomatoes, and potatoes) have recently grown. Some peppers such as Jalapeño, cayenne, and mirasol prefer arid regions; others such as habanero, Scotch bonnet and datil prefer humid regions.

Planting time. Hot peppers grow best in daytime air temperatures 65° to 80°F (18-26°C) and night temperatures above 55°F /13°C (nighttime temperatures between 60° and 70° are best). Peppers are most easily grown from transplants. Start seed indoors 7 to 10 weeks before the date you intend to set peppers into the garden. Peppers can be seeded in the garden or transplanted out 2 to 3 weeks after the last frost in spring after the soil temperature has risen to at least 65°F. In temperatures greater than 85°F (29°C), peppers may drop their blossoms although set fruit will ripen. The ideal temperature for hot peppers is a daytime temperature around 75°F (24°C) and a nighttime temperature around 62°F. Generally, you can set out peppers at the same time you set tomatoes or basil into the garden.

Planting and spacing. Sow hot pepper seeds ¼ to ½ inch deep, 18 to 24 inches (45-61 cm) apart depending upon the variety. Space rows 24 to 36 inches (61-91 cm) apart. Sow three seeds to each spot and thin to the two most successful seedlings. Peppers can be transplanted into the garden when they are 4 to 6 inches (10-15 cm) tall.

Water and feeding. Keep peppers evenly moist but not wet particularly when blossoms appear and fruit begin to form. Soil that goes too dry can result in flower drop. Keep the soil evenly moist just after transplanting peppers to the garden; avoid under or over watering peppers early on. Add aged compost to planting beds before planting and again at midseason.

Once hot pepper plants are established you can vary the watering. Hot peppers that are deprived of water and become slightly stressed will produce more pungent fruit.

Companion plants. Beets, garlic, onions, parsnips, radishes.

Care. Keep planting beds well weeded to avoid competition. Peppers are shallow-rooted, so cultivate around peppers with care. Mulch to keep soil temperature and moisture even.

Avoid high nitrogen fertilizers which will create large leafy plants with few or no fruits. High temperatures and wind can cause flowers to drop and plants not to set fruit.

Plastic mulch can improve pepper yields. Organic compost mulches will reduce weeding and watering, but not fruit yields.

Hot peppers can put out shoots that become leggy. Cut these shoots back to keep the plant compact.

Peppers will begin to flower almost as soon as the plant forms branches. Pepper plants have complete flowers which means each flower contains both a male and female part; as a result, the pepper is self-pollinating. Wind, bees and other insects, and a light shake of the plant by a human hand can aid pollination.

Container growing. Peppers can be grown in a large container. An 8-inch (20 cm) pot will accommodate a single plant. In larger containers, set plants on 12 inch (30 cm) centers. Peppers can be grown indoors. Peppers started indoors before the last frost in spring will get a head start on the season. Extend the season in the fall by moving plants indoors if frost threatens or if temperatures warm to greater than 90°F (32°C). Bring outdoor started peppers inside for a few hours a day at first until they get used to the lower light available indoors.

Pests. Peppers can be attacked by aphids, cutworms, flea beetles, and hornworms. Discourage cutworms by placing a collar around each transplant at the time of planting; hand pick hornworms off of plants. Flea beetles and aphids can be partially controlled by hosing them off the plants and pinching out infested foliage.

Diseases. Peppers are susceptible to rot, blossom end rot, anthracnose, tobacco mosaic virus, bacterial spot, and mildew. Plant disease-resistant varieties. Keep the garden clean and free of weeds where pests and diseases can shelter. Remove infected plants before disease can spread. If you smoke, wash your hands before working with the plants to avoid spreading tobacco mosaic virus.

Harvest. Hot peppers are ready for harvest in 60 to 95 days after sowing depending upon the variety. Most hot peppers mature from green to red as the seeds inside mature. Green hot peppers are not ripe, although some people prefer the flavor of green hot peppers. Red peppers are ripe and have a fruitier flavor. The hottest chili peppers are usually orange colored. Cut the peppers off the vine. Pulling a pepper away from the plant may cause the plant to come out of the soil. To prolong the harvest, cut peppers from the plant regularly; a hot pepper harvest can last from one to three months.

Harvest safety. Hot peppers contain organic chemicals called capsaicinoids which can burn the skin and eyes. Wear rubber gloves when harvesting hot peppers and be careful not to rub your eyes. The best antidote for burning skin to to rub them with isopropyl (rubbing) alcohol.

Varieties. See the article Hot Peppers for the Vegetable Garden.

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14 Comments

    • Mulch hot peppers with well-aged compost. Aged compost is both rich in nutrients and loose–allowing seeds to easily emerge after germination. As well aged compost is rich in all the major and minor nutrients that hot peppers need for best growth. Aged compost also holds soil moisture and will require less water during the hottest months of summer.

    • An NPK ratio of 1-2-1 or 1-2-2 is best for peppers and other summer fruiting crops such as tomatoes and eggplants. Common fertilizer package labels will read 5-10-5 or 5-10-10 or 2-4-2 or 2-4-4. Low nitrogen, higher phosphorus (for flower, fruit, and root development) and higher potassium for all-around health and environmental tolerance.

  1. Growing New Mexico chili here in Maui, Hawaii. Seeds from chilipepper inst. at New Mexico St. Univ. Started in January So far so good. Channel 13 in Albuquerque did a Zoom TV interview with me. Was fun.

    • Eggplants temperatures consistently between 70° and 90°F to reach harvest; if night or day temperatures are falling below 70°F on a consistent basis and you don’t have a way to keep the temperatures warm, then it’s time to move on to cool-season crops.

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Hot Peppers for the Vegetable Garden