Sweet Peppers in Zone 7A — Mid-Atlantic

Sweet peppers are a rewarding addition to any Mid-Atlantic garden. Their sweet flavor and crisp texture shine in summer salads, stir-fries, and grilled dishes. Plus, watching those green fruits transform into vibrant reds, yellows, and oranges is pure gardening satisfaction, especially after our relatively moderate spring.

Our humid summers and variable spring weather can present challenges, but with careful timing and a few preventative measures, you can enjoy a bountiful pepper harvest. The Mid-Atlantic's 208-day growing season is usually plenty long enough to get those peppers from seed to table.

Starting sweet pepper seeds indoors gives you a head start on our growing season. Aim to sow your seeds from mid February through early March, about eight weeks before you plan to transplant them outside. This lets you maximize our moderate spring weather.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist (bottom watering is great for this), and provide warmth using a heat mat. Once seedlings emerge, ensure they receive plenty of light – a grow light works well, especially if our spring weather is cloudy.

Transplant your sweet pepper seedlings outdoors from mid April through mid May, once the danger of frost has passed and the soil has warmed up. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This acclimates them to the sun and wind, preventing transplant shock.

Space your pepper plants 18-24 inches apart in a sunny spot with well-drained soil. Be mindful of late frosts; keep row covers handy in case of an unexpected cold snap.

Sweet peppers need consistent moisture to produce thick, sweet-walled fruits, especially during our humid summers. A good rule of thumb is to water deeply whenever the top two inches of soil feel dry to the touch – the "finger test." In general, aim for about 1-2 inches of water per week, depending on rainfall.

Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. Overhead watering is fine occasionally, but avoid doing it in the evening. Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot.

Mulching around your pepper plants with straw or shredded leaves helps retain soil moisture, suppress weeds, and regulate soil temperature, all of which are beneficial in our variable Mid-Atlantic climate.

While not always essential, staking or caging your sweet pepper plants can be beneficial, especially for heavier-fruiting varieties. The bush-like growth habit can sometimes lead to branches breaking under the weight of the peppers.

Install stakes or cages at planting time to avoid disturbing the roots later. Simply tie the main stems to the stakes as the plant grows, or let the plant grow through the cage. This will keep the plants upright and prevent the fruit from touching the soil.

Pinching off the first few flowers that appear on your sweet pepper plants can encourage stronger root development and lead to higher overall yields later in the season. This is especially helpful in our region, giving the plants a boost before our humid summer kicks in.

Remove any suckers (small shoots that grow from the base of the plant) to improve airflow and prevent disease. As the end of the season approaches (late October), you can remove any new flowers to encourage the plant to focus its energy on ripening the existing fruit before frost.

You can expect your first sweet pepper harvest from late June through mid August, about 65 days after transplanting. The peppers are ready to pick when they've reached their full size and turned their mature color (red, yellow, orange, depending on the variety). Remember, the longer they ripen on the plant, the sweeter they'll be.

Use sharp pruners or scissors to cut the peppers from the plant, leaving a short piece of stem attached. Regular harvesting encourages continuous production throughout the season. As frost threatens in late October, harvest any remaining green peppers and bring them indoors to ripen. They may not be as sweet as vine-ripened peppers, but they'll still be delicious.

Blossom Drop

• What it looks like: Flowers fall off without setting fruit, or small fruit yellows and drops. The plant looks healthy otherwise.
• What causes it: Temperature stress is the main culprit. In the Mid-Atlantic, this often happens during our hot, humid summer nights. Low humidity, excess nitrogen, and 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. Try hand-pollination by gently shaking the plants.

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. You might also notice sticky honeydew residue and curled or distorted new growth.
• What causes it: These sap-sucking insects thrive in warm weather and reproduce rapidly. Ants often "farm" them for their honeydew. Excess nitrogen also attracts them.
• How to fix/prevent it: Knock them off with a strong spray of water. Encourage natural predators like ladybugs and lacewings. Insecticidal soap works well for heavy infestations, as does neem oil. Avoid over-fertilizing with nitrogen.

Sunscald

• What it looks like: White, papery patches on fruit exposed to direct sun. These 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 peppers.
• How to fix/prevent it: Avoid over-pruning foliage. Use shade cloth during heat waves. 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. It 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.
• How to fix/prevent it: Water consistently – this is the single most effective fix, especially given our region's tendency for heavy rain followed by dry spells. Mulch heavily to maintain even soil moisture. Avoid over-fertilizing with nitrogen. Calcium sprays can help, but consistent watering is key. Remove affected fruit.

Mid-Atlantic Specific Challenges: Our moderate-to-hot summers and humid conditions can exacerbate problems like blossom drop and fungal diseases. Consistent watering is crucial to combat blossom end rot. Keep an eye out for aphids and Japanese beetles, which thrive in our region's climate.

Good companions for sweet peppers in the Mid-Atlantic include tomatoes, basil, carrots, onions, and spinach. Tomatoes and peppers are in the same family and have similar needs. Basil repels pests like aphids and whiteflies. Carrots loosen the soil and deter nematodes. Onions also deter pests. Spinach provides ground cover, suppressing weeds and keeping the soil cool and moist.

Avoid planting fennel, kohlrabi, or other brassicas near your sweet peppers. Fennel inhibits the growth of many plants. Kohlrabi and other brassicas compete for the same nutrients and can attract pests that also affect peppers.