Snap Peas in Zone 6A — Southeast

Snap peas are a fantastic addition to any Southeast garden. Their sweet, crisp pods are delicious raw, stir-fried, or added to salads. Plus, they thrive in our long growing season, offering a rewarding harvest from spring all the way into fall.

While the hot and humid summers here in the Southeast can present some challenges with fungal diseases and pests, careful timing and proper care can help you enjoy a bountiful snap pea harvest. Our 198-day growing season gives you plenty of opportunity to get it right.

You can transplant snap peas outdoors from mid-March through early April. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun, wind, and temperature fluctuations.

Space your transplants 3-4 inches apart in well-drained soil. Keep an eye on the weather forecast, as late frosts can still occur during this time in the Southeast. If a frost is predicted, cover your seedlings with blankets or row covers to protect them.

Direct sowing is the preferred method for growing snap peas. Here in the Southeast, you can start sowing seeds late February through mid August. Aim for a soil temperature of at least 45°F for best germination.

Prepare your soil by loosening it and adding compost or other organic matter. Plant seeds 1 inch deep and 3-4 inches apart. Keep the soil consistently moist until the seedlings emerge, which usually takes about a week. Since we often get reliable spring rain, this should be easy.

Snap peas need consistent moisture to produce plump, sweet pods. But with our humid summers and frequent afternoon thunderstorms, it's important to avoid overwatering. Aim for about 1 inch of water per week, including rainfall.

Use the "finger test" to check soil moisture: stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. Water at the base of the plants to avoid wetting the foliage, which can encourage fungal diseases in our humid climate. Overhead watering is OK if done early in the morning so the leaves can dry before nightfall.

During the hot summer months, you might need to water more frequently, especially if we have a dry spell. Signs of underwatering include wilting leaves and stunted pod development. Overwatering can lead to yellowing leaves and root rot. A layer of mulch, like pine straw or shredded leaves, can help retain moisture and suppress weeds, but avoid piling it up against the stems.

Snap peas are vining plants and need support to climb. A trellis, chicken wire, or even a simple string trellis works well. Aim for a support that is 4-6 feet tall.

Install the support at planting time to avoid disturbing the roots later. As the plants grow, gently guide the vines onto the support. Snap peas will naturally climb on their own, but you might need to help them get started.

You can expect your first snap pea harvest in late April and continue harvesting through early November here in the Southeast. Snap peas are ready to harvest about 60 days after planting. Look for pods that are plump, crisp, and have fully developed peas inside.

Harvest the pods when they are young and tender for the best flavor. To harvest, gently snap the pods off the vine, being careful not to damage the plant. Regular harvesting encourages continued production. As the first frost approaches in late October, harvest all remaining pods, even the smaller ones.

Snap peas can face a few common problems in the Southeast.

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems. Leaves curl, yellow, and die.
• What causes it: Fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it. Our humid summers definitely encourage this.
• How to fix/prevent it: Improve air circulation through spacing and pruning. Remove affected leaves. Neem oil or potassium bicarbonate sprays help. Milk spray (1 part milk to 9 parts water) is surprisingly effective. Plant resistant varieties.

Pea Aphids

• What it looks like: Small, soft-bodied insects (green, pink, or white) clustered on stems and leaves. Stunted growth and distorted leaves. Sticky honeydew.
• What causes it: Aphids are attracted to stressed plants. Warm weather and high humidity can contribute to outbreaks.
• How to fix/prevent it: Strong blast of water from hose. Insecticidal soap or neem oil. Encourage beneficial insects like ladybugs and lacewings.

Root Rot

• What it looks like: Yellowing leaves, stunted growth, wilting, and mushy brown roots.
• What causes it: Overwatering and poorly drained soil. Fungi thrive in wet conditions. Our heavy clay soil can exacerbate this issue.
• How to fix/prevent it: Improve soil drainage by adding compost and other organic matter. Avoid overwatering. Plant in raised beds if necessary. Use a fungicide if needed, but prevention is key.

Fusarium Wilt

• What it looks like: Wilting on one side of the plant first, then spreading. Yellow leaves starting on one side. Brown streaks in stem when cut open.
• What causes it: Soil-borne fungus (Fusarium oxysporum). Persists in soil for years. Enters through roots. Warm soil temperatures favor it.
• How to fix/prevent it: No cure once infected — remove and destroy the plant. Plant resistant varieties (look for 'F' on seed labels). Rotate crops on a 4-year cycle. Solarize soil in hot zones. Raise soil pH above 6.5.

Southeast Specific Challenges: The hot and humid conditions in the Southeast can create a breeding ground for fungal diseases like powdery mildew and root rot. Our wet-summer rainfall also means that it's especially important to ensure good soil drainage and avoid overwatering. Japanese beetles can also be a nuisance, feeding on the leaves and pods.

Snap peas benefit from companion planting. Carrots and radishes loosen the soil, making it easier for snap peas to grow strong roots. Cucumbers and corn provide natural trellises for the peas to climb. Lettuce provides ground cover, suppressing weeds and keeping the soil cool.

Avoid planting snap peas near onions and garlic, as these can inhibit their growth. These alliums release compounds into the soil that can stunt the growth of legumes like snap peas.