Sweet Peppers in Zone 8B — Southeast

Sweet peppers are a fantastic addition to any Southeast garden. Their sweet, mild flavor adds a delicious touch to our favorite Southern dishes, from grilled skewers to stuffed peppers. Plus, the satisfaction of harvesting your own colorful peppers after our long summer is truly rewarding.

Our hot and humid summers can present some challenges, but with a little planning, you can absolutely grow a bumper crop of sweet peppers. The long 255-day growing season in Zone 8B gives you plenty of time to get them established and producing before our first frost.

Starting your sweet pepper seeds indoors is the way to go here in the Southeast. Starting in mid January through early February gives those peppers a head start, since they need a good 8 weeks indoors before transplanting. This allows them to get strong enough to handle our long, hot summer.

Use seed trays with a good seed-starting mix. Keep them warm – around 75-80°F is ideal – using a heat mat if needed. Once the seedlings emerge, make sure they get plenty of light. A grow light works wonders, especially since our spring weather can be a bit unpredictable. Don’t forget to water from the bottom to encourage strong root growth and prevent damping off, a common problem in our humid climate.

Remember, spring here in the Southeast starts moderately, so giving your peppers this indoor head start is crucial for a successful harvest.

Transplanting your sweet pepper seedlings outdoors should happen in late March through late April. By then, the soil has warmed up, and the risk of a late frost has usually passed. Before you plant them in the ground, be sure to harden them off. This means gradually exposing them to outdoor conditions over about a week.

Plant your seedlings 18-24 inches apart in well-draining soil. Our clay soil can be a challenge, so amend it with plenty of compost to improve drainage and fertility. Even after our last frost date, keep an eye on the weather forecast. A sudden temperature swing can still happen, so be ready to cover your transplants if needed.

Consistent watering is key to getting thick, sweet walls on your sweet peppers, especially with our hot and humid summers. The flavor really improves when they have a steady supply of moisture.

During the hotter months, you'll likely need to water your peppers deeply a couple of times a week, aiming for about 1-2 inches of water each time. Stick your finger about 2 inches deep into the soil – if it feels dry, it's time to water. With our high humidity, it's best to water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases. On the other hand, if we are in a dry spell, afternoon thunderstorms are common, so check the soil after a heavy rain to see if you need to supplement.

Keep an eye out for signs of underwatering, like wilting leaves, or overwatering, like yellowing leaves. A good layer of mulch around your plants helps retain moisture and regulate soil temperature, which is especially important during our long summer.

While not always necessary, some sweet pepper varieties can get quite large and benefit from staking, especially when they're loaded with fruit. This is more important for taller varieties that tend to get top-heavy.

Tomato cages or sturdy stakes work well. Install them at planting time to avoid disturbing the roots later on. As the plant grows, gently tie the stems to the support using soft twine or plant ties. This will prevent the branches from breaking under the weight of the peppers, and help keep the fruit off the ground.

Pinching off the first few flowers that appear on your sweet pepper plants is a great way to encourage stronger establishment and higher overall yields. It might seem counterintuitive, but removing those early flowers directs the plant's energy into developing a strong root system and healthy foliage.

Just pinch them off with your fingers as soon as you see them. Later in the season, around mid- to late summer, you can remove any yellowing or diseased leaves to improve air circulation and prevent the spread of fungal problems. As our first frost approaches around mid- November, remove any new flowers so the plant focuses its energy on ripening the existing fruit.

You can expect your first harvest of sweet peppers in late May through mid July, about 65 days after transplanting. The best sign of ripeness is when the peppers have reached their full size and color for the variety you're growing. Remember, they get sweeter the longer they ripen on the plant.

To harvest, use pruning shears or a sharp knife to cut the pepper from the plant, leaving a short piece of stem attached. Be careful not to damage the surrounding branches or fruit. Keep harvesting regularly to encourage continued production. Even as our first frost approaches in mid- November, you can still harvest any mature green peppers and allow them to ripen indoors.

Here are some common problems you might encounter growing sweet peppers in the Southeast:

• 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 main culprit. Peppers don't set fruit well when nights stay above 75°F or days exceed 95°F. Low humidity, excess nitrogen, or poor pollination can also contribute.
• How to fix/prevent it: Be patient – fruit set usually resumes when temperatures moderate. Provide afternoon shade during extreme heat. Keep plants well-watered. Avoid excess nitrogen fertilizer. Try hand-pollination if needed.
• Aphids
• What it looks like: Clusters of tiny soft-bodied insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: These sap-sucking insects reproduce rapidly, especially in warm weather. Ant colonies may "farm" them for the honeydew they produce.
• How to fix/prevent it: A strong spray of water from the hose can knock them off. Encourage natural predators like ladybugs and lacewings. Use insecticidal soap for heavy infestations. Neem oil also works well. Avoid excess nitrogen fertilizer, which attracts them.
• Sunscald
• What it looks like: White, papery patches on fruit exposed to direct sun. Affected areas may blister and become susceptible to rot.
• What causes it: Intense, direct sunlight on fruit, usually after leaves are removed or lost to disease, suddenly exposing previously shaded fruit.
• How to fix/prevent it: Avoid over-pruning foliage. Use shade cloth during extreme heat. Maintain healthy foliage to shade fruit naturally. If fruit is already exposed, drape a small piece of row cover over it.
• Blossom End Rot
• What it looks like: Sunken, dark brown or black leathery patch on the bottom (blossom end) of the fruit. Often affects the first fruits of the season.
• What causes it: Calcium deficiency caused by inconsistent watering. It's not a disease, but a nutrient uptake problem triggered by drought/flood cycles, common in our wet-summer climate.
• How to fix/prevent it: Water consistently! Mulch heavily to maintain even soil moisture. Don't over-fertilize with nitrogen. Calcium sprays may help a little. Remove affected fruit.

Southeast Specific Challenges: Our hot and humid climate can increase the risk of fungal diseases on sweet peppers. Good air circulation and proper watering practices are crucial. Also, Japanese beetles can be a nuisance, so be prepared to hand-pick them or use appropriate control methods. And don't forget about the deer, who love a good pepper plant snack! Fencing or repellents are often necessary.

Companion planting can be a great way to improve the health and productivity of your sweet peppers. Tomatoes make excellent companions because they share similar growing requirements and can provide shade during the hottest part of the day. Basil is another good choice, as it repels many common pepper pests and is said to improve the flavor of the peppers.

Carrots and onions are also beneficial, as they deter soil-borne pests. Spinach can be planted between the pepper plants to act as a living mulch, suppressing weeds and conserving moisture. Avoid planting fennel, kohlrabi, or other brassicas near your peppers, as they can inhibit growth or attract pests.