Sweet Peppers in Zone 7B — Southeast

Sweet peppers are a fantastic addition to any Southeast garden. Their sweet flavor and crisp texture are delicious fresh, grilled, or stuffed. Plus, they thrive in our long, warm summer, giving you a satisfying harvest that extends for months.

While our hot and humid summers can present challenges, the long growing season gives you plenty of time to get your peppers established and producing before the worst of the heat hits. By starting seeds indoors and timing your transplant carefully, you can beat many of the common problems and enjoy a bountiful harvest from early June all the way to the first frost in early November. That's a lot of peppers from our 235-day growing season!

Starting your sweet pepper seeds indoors from late January through mid February is the way to go in the Southeast. This gives them a head start and ensures they're strong enough to withstand our transition to the outdoor garden. Starting them about 8 weeks before you plan to transplant outdoors works best.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist (but not soggy!) by bottom watering. Place the trays in a warm location, ideally around 75-80°F, and provide plenty of light. A sunny windowsill might work, but supplemental grow lights will give you stronger, stockier seedlings. Remember, our spring weather can be moderate, so even a sunny window might not give them enough light.

Transplanting your sweet pepper seedlings outdoors in early April through early May is ideal in our region. Before you move them permanently, be sure to harden them off. This means gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade and increase the time and sunlight each day.

When transplanting, space your pepper plants 18-24 inches apart. This gives them plenty of room to grow and allows for good air circulation, which is crucial in our humid climate. Choose a sunny spot with well-drained soil, and be prepared for those occasional late-season cold snaps that can still happen in early April.

Consistent watering is essential for sweet peppers in the Southeast, especially with our hot and humid summers. Aim to provide about 1-2 inches of water per week, either through rainfall or irrigation. Use the "finger test" – stick your finger about 2 inches into the soil. If it feels dry, it's time to water.

During the hottest part of the summer, you might need to water more frequently, especially if the afternoon thunderstorms skip your garden. 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 blossom drop. Overwatering can lead to yellowing leaves and root rot.

Mulching around your pepper plants with straw or pine straw helps retain moisture, suppress weeds, and regulate soil temperature, which is especially important with our clay soil and intense summer heat.

While not always necessary, providing support for your sweet pepper plants can be beneficial, especially as they become laden with fruit. Some varieties get quite large and can topple over, especially after a heavy rain or gusty afternoon thunderstorm.

Staking is a simple and effective method. Use sturdy stakes and tie the main stem loosely to the stake with soft twine. Install the stakes at planting time to avoid disturbing the roots later on. Cages also work well, providing all-around support as the plant grows.

Pruning sweet peppers isn't essential, but pinching off the first few flowers that appear can encourage the plant to focus its energy on vegetative growth. This results in a stronger, more productive plant in the long run.

Simply pinch off the flowers as soon as you see them. Don't remove any leaves unless they are damaged or diseased, as the foliage helps shade the fruit and protect it from sunscald. As the first frost approaches in early November, you can remove any small, immature peppers to encourage the plant to put its remaining energy into ripening the larger fruits.

You can expect your first sweet pepper harvest from early June through late July, about 65 days after transplanting. Peppers are typically ready to harvest when they reach their full size and develop their mature color – whether that's red, yellow, orange, or purple, depending on the variety.

Gently twist or cut the pepper from the plant, being careful not to damage the stem. Regular harvesting encourages continuous production. Even if green, they are still edible! As the end of the season approaches and the threat of frost looms in early November, harvest any remaining peppers, even if they aren't fully ripe. You can ripen them indoors by placing them in a paper bag with a ripe banana or apple.

Sweet peppers, like all garden plants, can sometimes run into problems. Here are some common issues we see 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 peppers.
• What causes it: Temperature stress is the main culprit. Peppers don't like nights above 75°F or days exceeding 95°F. Low humidity, excess nitrogen, or poor pollination can also contribute.
• How to fix/prevent it: Be patient! Fruit set will resume when temperatures moderate. Provide afternoon shade during extreme heat. Keep plants well-watered. Avoid excess nitrogen fertilizer. Try hand-pollination by gently shaking the plant.

Aphids

• What it looks like: Clusters of tiny insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: Rapid-reproducing sap-sucking insects thrive in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: A strong spray of water knocks them off. Encourage ladybugs and lacewings (natural predators). Insecticidal soap works well for heavy infestations. Neem oil works systemically. 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: Don't over-prune 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: 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, especially in our clay soil. 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. Calcium sprays can help marginally. Remove affected fruit.

Southeast Specific Challenges: Our hot and humid climate can exacerbate these problems. High humidity encourages fungal diseases, making it essential to water at the base of the plants and provide good air circulation. The intense summer heat can also lead to blossom drop and sunscald, so be prepared to provide shade during the hottest part of the day. And don't forget about the Japanese beetles!

Companion planting can be a great way to improve the health and productivity of your sweet peppers.

Good companions include tomatoes, as they have similar growing requirements and can provide some shade for each other. Basil is another excellent choice, as it repels many common pepper pests and is thought to improve the flavor of the peppers. Carrots and onions are also beneficial, as they help to deter soil pests and improve soil drainage. Spinach can be planted as a ground cover to help retain moisture and suppress weeds.

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 affect your peppers.