Jalapeño Peppers in Zone 8B — Southeast

Jalapeño peppers are a must-grow in the Southeast. Their zesty flavor adds a kick to everything from Southern staples like grits to grilling favorites. Plus, the satisfaction of harvesting your own peppers after our long, hot summer is hard to beat.

While the hot and humid conditions here can present challenges, starting your jalapeños indoors gives them a head start. With our lengthy 255-day growing season, you'll have plenty of time to enjoy a bountiful harvest.

Get your jalapeño seeds started indoors from mid January through early February, about eight weeks before you plan to transplant them outside. Use seed trays with a good seed-starting mix. A heat mat underneath helps with germination, and grow lights ensure strong, healthy seedlings.

Keep the soil consistently moist, but not soggy. Bottom watering is a great trick to avoid damping off. Place the tray in a shallow container of water and let the soil soak it up from the bottom.

Remember, our springs here in the Southeast can be moderate, so don't rush to get them outside too early. Patience is key!

Transplant your jalapeño seedlings into the garden from late March through late April, once the danger of frost has passed. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Space the plants 14-18 inches apart in well-drained soil. Keep an eye on the weather forecast. We can still get some cool snaps during this time, so be ready to cover your seedlings if needed.

Jalapeños need moderate and consistent watering, especially during our hot and humid summers. Aim for about 1-2 inches of water per week, depending on rainfall. Use the "finger test" – stick your finger about two inches into the soil. If it feels dry, it's time to water.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. While our summers bring plenty of rainfall, afternoon thunderstorms aren't always reliable. Consistent moisture is key for good pepper production.

In the early part of the growing season, you might need to water only a couple of times per week. During the hottest part of the summer, you might need to water every other day. Signs of underwatering include wilting leaves, while yellowing leaves can indicate overwatering. A good layer of mulch, like pine straw or shredded hardwood, helps retain moisture and suppress weeds.

While not strictly required, supporting your jalapeño plants can be a good idea, especially as they get loaded down with peppers. These plants are bush-type, and a single stake is often enough to keep them upright and prevent branches from breaking.

Install the stake at planting time to avoid damaging the roots later. Gently tie the main stem to the stake with soft twine or plant ties. As the plant grows, add additional ties as needed.

Pinching off the first few flowers that appear on your jalapeño plants encourages them to put more energy into vegetative growth, resulting in stronger, more productive plants. Remove any corking fruit if you prefer smooth peppers.

Simply snip off the flowers or fruit with clean pruning shears. As the season winds down and our first frost approaches around mid- November, you can stop pruning and let the remaining peppers ripen.

You can expect your first jalapeño harvest from early June through late July, about 75 days after transplanting. Harvest the peppers when they are 3-4 inches long and green, or wait for them to turn red for a sweeter, hotter flavor. Corking lines on the pepper indicate maturity.

Use pruning shears or a sharp knife to cut the peppers from the plant, leaving a small piece of stem attached. Regular harvesting encourages the plant to continue producing. As the first frost approaches in mid- November, harvest all remaining peppers. Green peppers will ripen indoors if stored in a cool, dry place.

Blossom Drop

• What it looks like: Flowers fall off without setting fruit, and small fruit yellows and drops. The plant itself looks healthy, but produces little to no peppers.
• What causes it: Temperature stress, especially when nighttime temperatures stay above 75°F or daytime temperatures exceed 95°F. Low humidity, excess nitrogen, or poor pollination can also contribute.
• How to fix/prevent it: Be patient, as fruit set typically resumes when temperatures moderate. Provide afternoon shade during periods of extreme heat. Keep plants well-watered and avoid excess nitrogen fertilizer. 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. Sticky honeydew residue and curled or distorted new growth are also common signs.
• What causes it: These sap-sucking insects reproduce rapidly, and populations can explode in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: A strong spray of water can knock them off. Encourage natural predators like ladybugs and lacewings. Insecticidal soap is effective for heavy infestations, and neem oil works systemically. Avoid excess nitrogen fertilizer, as it attracts aphids.

Pepper Maggots

• What it looks like: Small, white, legless larvae tunneling inside the pepper fruits. This causes the peppers to rot and become misshapen. You may also see small exit holes in the peppers.
• What causes it: Adult pepper maggots lay their eggs on the developing peppers. Once hatched, the larvae burrow inside, feeding on the flesh.
• How to fix/prevent it: Use sticky traps to catch adult flies. Remove and destroy any infested peppers immediately. Insecticides containing spinosad can be effective, but apply them carefully, following label instructions. Crop rotation can also help reduce infestations.

Bacterial Leaf Spot

• What it looks like: Small, dark, water-soaked spots on leaves that eventually turn brown or black. The spots may have a yellow halo. In severe cases, the leaves can drop off.
• What causes it: This bacterial disease thrives in warm, humid conditions. It is often spread by splashing water or contaminated tools.
• How to fix/prevent it: Remove and destroy any infected leaves. Avoid overhead watering and improve air circulation around the plants. Copper-based fungicides can help prevent the spread of the disease.

Southeast Specific Challenges: The hot, humid conditions and wet-summer rainfall of the Southeast can create a breeding ground for fungal diseases and pests like aphids and pepper maggots. Choose disease-resistant varieties, provide good air circulation, and monitor your plants regularly to catch problems early.

Tomatoes make great companions for jalapeños because they attract beneficial insects that prey on pepper pests. Basil repels many common pests, including aphids and whiteflies, and is said to improve the flavor of peppers. Carrots can help loosen the soil around jalapeño plants, improving drainage. Onions deter pests like spider mites and also act as a natural fungicide.

Avoid planting jalapeños near fennel or kohlrabi. Fennel inhibits the growth of many plants, including peppers, while kohlrabi can attract cabbage worms, which can also damage pepper plants. By choosing the right companions, you can create a thriving and productive garden, even in the challenging conditions of the Southeast.