Jalapeño Peppers in Zone 10A — Florida

Jalapeño peppers are a must-grow for any Florida gardener. Their spicy kick adds zest to everything from salsas to grilled dishes, and the satisfaction of harvesting your own peppers, especially in our long growing season, is hard to beat. Plus, they're surprisingly versatile in the kitchen.

Sure, we face challenges like humidity and nematodes here in Florida. But with careful timing, starting your peppers indoors, and choosing nematode-resistant varieties, you can enjoy a bountiful harvest. Our 355-day growing season gives you plenty of opportunity to get it right.

Starting your jalapeño pepper seeds indoors is the way to go here in Florida. Begin in late November through mid December. This gives the seedlings about 8 weeks to get a head start before the weather is right for transplanting. Remember, our spring character is reversed, so we're preparing for warmth when much of the country is bracing for cold.

You'll need seed trays, a good seed-starting mix, and a warm, bright location. A heat mat can help speed up germination. Bottom watering is key to preventing damping off – set your seed trays in a shallow tray of water and let them soak it up from the bottom. Once they sprout, make sure they have plenty of light; a grow light is ideal.

Transplant your jalapeño pepper seedlings outdoors in late January through late February. Before you do, harden them off by gradually exposing them to outdoor conditions for about a week. This prevents transplant shock.

Space your plants about 14-18 inches apart in a sunny spot. At transplant time, keep an eye out for any late cold snaps that sometimes occur in Florida. If a freeze is predicted, cover your seedlings to protect them.

Consistent watering is key for jalapeño peppers, but in Florida, we have to be smart about it. During our drier months, you'll likely need to water a couple of times a week. Stick your finger about two inches into the soil; if it feels dry, it's time to water. Aim for about 1-2 inches of water per week, depending on rainfall.

In the rainy season, you'll naturally need to cut back. With our high humidity, it's best to water at the base of the plant to avoid creating a humid environment that encourages fungal diseases. Overwatering can be just as harmful as underwatering. Yellowing leaves are a sign of overwatering, while wilting leaves indicate underwatering.

Mulching around your plants with pine straw or wood chips helps retain moisture and suppress weeds, which is a big help in our sandy soil.

While not strictly necessary, supporting your jalapeño pepper plants can be a good idea, especially as they get loaded with fruit. The plants can get top-heavy and the branches can break, particularly after a heavy rain.

A single stake is usually sufficient. Install the stake at planting time, a few inches away from the stem, to avoid damaging the roots. As the plant grows, gently tie the main stem to the stake with soft twine. This helps keep the plant upright and prevents the fruit from touching the soil.

Pruning jalapeño peppers in Florida is pretty straightforward. Pinch off any early flowers that appear before the plant is well-established. This encourages the plant to focus its energy on developing a strong root system and foliage, leading to a bigger harvest later.

Also, if you notice any peppers developing corking lines (those stretch marks on the fruit) and you prefer smooth peppers, you can remove those. As the end of the season approaches around late December, you can remove any new flowers to encourage the plant to ripen existing peppers before any possible frost.

You can expect your first jalapeño harvest in early April through late May. Jalapeños are typically harvested green when they are about 3-4 inches long, but you can also let them ripen to red for a sweeter, hotter flavor. Corking lines on the fruit are a sign of maturity, regardless of color.

To harvest, use pruning shears or a sharp knife to cut the pepper from the plant, leaving a small piece of stem attached. Avoid pulling the peppers, as this can damage the plant. Regular harvesting encourages continued production.

As late December approaches, keep an eye on the forecast. If a frost threatens, harvest all remaining peppers, even the green ones. They will ripen indoors in a warm, bright location.

Blossom Drop

• What it looks like: Flowers fall off without setting fruit. Small fruit yellows and drops. The plant looks healthy but produces no fruit.
• What causes it: Temperature stress is the biggest culprit. Here in Florida, our nighttime temperatures can stay above 75°F, or daytime temperatures exceed 95°F. Low humidity, excess nitrogen, or poor pollination can also cause it.
• How to fix/prevent it: Be patient; fruit set usually resumes when temperatures moderate. Provide afternoon shade during the hottest part of the day. Keep plants well-watered but avoid over-fertilizing with nitrogen. You can also try hand-pollination.

Aphids

• What it looks like: Clusters of tiny soft-bodied insects (green, black, or white) on stems and leaf undersides. You might see sticky honeydew residue or curled, distorted new growth.
• What causes it: These sap-sucking insects reproduce rapidly, and populations explode in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: A strong spray of water from the hose can knock them off. Encourage natural predators like ladybugs and lacewings. Insecticidal soap works well for heavy infestations, and neem oil acts systemically. Avoid excess nitrogen fertilizer.

Pepper Maggots

• What it looks like: Distorted or misshapen peppers with small entry holes. Inside, you'll find small, white larvae (maggots) feeding on the pepper flesh.
• What causes it: Pepper maggots are the larvae of the pepper fruit fly. The adult fly lays its eggs inside the developing pepper.
• How to fix/prevent it: Use sticky traps to catch adult flies. Inspect peppers regularly and remove any that show signs of infestation. Insecticides containing spinosad can be effective. Crop rotation can also help.

Bacterial Leaf Spot

• What it looks like: Small, dark, water-soaked spots on leaves that enlarge and develop a yellow halo. Spots can also appear on stems and fruit. Severely affected leaves may turn yellow and drop.
• What causes it: This bacterial disease thrives in warm, humid conditions, which we certainly have here in Florida. Splashing water spreads the bacteria from plant to plant.
• How to fix/prevent it: Remove and destroy infected leaves. Avoid overhead watering. Improve air circulation by spacing plants properly. Copper-based fungicides can help prevent the spread of the disease.

Florida Specific Challenges: Our hot, humid summers and frequent rainfall create the perfect environment for fungal diseases. Nematodes in our sandy soil can also be a problem. Choose nematode-resistant varieties and use drip irrigation to keep the foliage dry. Regular monitoring and prompt treatment are key to keeping your jalapeño peppers healthy and productive.

Good companions for jalapeño peppers include tomatoes, basil, carrots, and onions. Tomatoes provide shade, helping to protect peppers from the intense Florida sun. Basil repels pests like aphids and whiteflies, plus it attracts beneficial insects. Carrots loosen the soil, improving drainage. Onions also repel pests and deter fungal diseases.

Avoid planting fennel and kohlrabi near jalapeño peppers. Fennel inhibits the growth of many plants, including peppers. Kohlrabi can attract pests that also affect peppers. Companion planting can be a great way to maximize your garden space and improve the health of your plants, but it is important to be mindful of the specific needs of each plant.