Sweet Peppers in Zone 8A — Southeast

Sweet peppers are a staple in any Southeastern garden. Their sweet flavor adds a delicious touch to everything from summer salads to grilled skewers, and they're incredibly versatile in the kitchen. Plus, there's nothing quite like the satisfaction of harvesting your own colorful peppers after a long summer in the garden.

Our hot and humid summers here in the Southeast can present challenges, especially with disease pressure. But with a little planning and attention to timing, you can easily grow a bumper crop of sweet peppers. With a long growing season of around 245 days, we have plenty of time to get these beauties from seed to harvest.

Starting sweet pepper seeds indoors gives you a head start in our climate. Begin in late January through mid February, roughly 8 weeks before you plan to transplant them outdoors. This allows the seedlings to get established before the heat really kicks in.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, and provide warmth (a heat mat helps) and plenty of light – a grow light is ideal. A tip for success is to bottom water your seedlings by placing the tray in a shallow dish of water, allowing the soil to soak it up from the bottom. This encourages strong root growth and prevents damping-off.

The good news is that spring is pretty moderate here, so you don't need to worry as much about wild temperature swings as some other regions.

Transplant your sweet pepper seedlings outdoors in late March through late April, after the danger of frost has passed. Before transplanting, harden them off by gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade, increasing the time and sun exposure each day.

Space your pepper plants about 18-24 inches apart in well-drained soil. We can still get some cool snaps in early spring, so keep an eye on the forecast and be prepared to cover your transplants if a cold front moves through.

Consistent watering is key to growing sweet, thick-walled peppers in our hot and humid climate. Aim to keep the soil consistently moist, but not waterlogged. The flavor really does improve when they get enough water.

During the hottest part of the summer, especially July and August, you'll likely need to water deeply about 1-2 times per week, providing around 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. Our afternoon thunderstorms can help, but don't rely on them entirely. Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our humid climate.

Signs of underwatering include wilting leaves and slow growth. Overwatering can lead to yellowing leaves and root rot. Mulching around your pepper plants with straw or pine straw helps retain moisture and suppress weeds.

While not always necessary, providing support for your sweet pepper plants can be beneficial, especially for heavy-yielding varieties. The bush-like growth habit can sometimes lead to branches snapping under the weight of the fruit.

Staking is a simple and effective method. Install sturdy stakes near each plant at planting time, and gently tie the main stems to the stakes as the plants grow. Tomato cages also work well, providing all-around support.

Pinching off the first few flowers that appear on your sweet pepper plants can encourage them to focus their energy on vegetative growth, resulting in stronger plants and higher overall yields later in the season.

Throughout the season, remove any yellowing or diseased leaves. As we approach our first frost around mid- November, you can remove any small, immature peppers to encourage the plant to ripen the larger ones before the cold weather arrives.

You can expect your first sweet pepper harvest in early June through late July, about 65 days after transplanting. Peppers are ready to harvest when they reach their full size and have developed their mature color – green, red, yellow, or orange, depending on the variety.

Sweet peppers get sweeter the longer they ripen on the plant. To harvest, use sharp pruners or scissors to cut the pepper from the plant, leaving a short stem attached. Regular harvesting encourages continued production.

As our first frost approaches, harvest any remaining mature peppers. You can also bring in any green peppers and allow them to ripen indoors in a warm, sunny location.

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

Blossom Drop

• What it looks like: Flowers fall off without setting fruit, or small fruit yellows and drops.
• What causes it: Temperature stress is the main culprit. Nights above 75°F or days exceeding 95°F can cause blossom drop. 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 with shade cloth during extreme heat. Keep plants well-watered. Avoid over-fertilizing with nitrogen.

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue and curled or distorted new growth are also telltale signs.
• What causes it: These sap-sucking insects reproduce rapidly, especially in warm weather. Ant colonies often protect them in exchange for honeydew.
• How to fix/prevent it: A strong spray of water can knock them off. Encourage natural predators like ladybugs and lacewings. Use insecticidal soap or neem oil for heavy infestations. 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 in 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: A sunken, dark brown or black leathery patch on the bottom (blossom end) of the fruit.
• What causes it: Calcium deficiency caused by inconsistent watering. It's not a disease, but a nutrient uptake problem triggered by drought/flood cycles.
• How to fix/prevent it: Water consistently – this is the single most effective fix. Mulch heavily to maintain even soil moisture. Don't over-fertilize with nitrogen.

Southeast Specific Challenges: Our hot and humid climate creates ideal conditions for fungal diseases on sweet peppers. Good air circulation, proper watering techniques, and choosing disease-resistant varieties are crucial for success. Japanese beetles can also be a nuisance, so be prepared to hand-pick them or use appropriate insecticides. Deer can also be a problem, so fencing is often necessary.

Companion planting can be a great way to improve the health and productivity of your sweet peppers. Tomatoes make excellent companions, as they have similar growing requirements and can provide shade. Basil repels pests like aphids and whiteflies, while also improving the flavor of the peppers. Carrots and onions can deter soil-borne pests, and spinach can act as a ground cover, suppressing weeds and retaining moisture.

Avoid planting sweet peppers near fennel, as it inhibits their growth. Kohlrabi and other brassicas like cabbage and broccoli can also compete for nutrients and attract pests that can harm your peppers.