Snap Peas in Zone 7A — Southeast

Snap peas are a true delight in the Southeast garden, offering a sweet, crunchy treat straight from the vine. The long summer here means you can often get two crops – one in spring and another in the fall. They’re incredibly versatile in the kitchen, perfect for snacking, stir-fries, or adding a fresh touch to salads.

We definitely have our share of gardening challenges in the Southeast, from the humidity to the occasional pest. However, with careful timing and a little attention, you can easily grow a bountiful crop of snap peas. Our long 225-day growing season gives you plenty of opportunities to get it right.

You can transplant snap peas outdoors in the Southeast from late February through late March. Before transplanting, be sure to harden off your seedlings. Give them about a week of gradual exposure to the outdoors, increasing the time each day.

Space your transplants about 3-4 inches apart. The weather during this period can be unpredictable, with temperature swings and potential late frosts. Keep an eye on the forecast and be prepared to cover your young plants if a freeze is predicted.

Direct sowing is the preferred method for snap peas, and thankfully it's easy. Here in the Southeast, you can direct sow from mid February through late August. For a spring crop, aim for mid February through early April. For a fall harvest, plant from mid August through mid September.

Before sowing, make sure your soil is well-drained and loose. Our clay soil can be a challenge, so amend with plenty of compost. The soil temperature should be at least 45°F for good germination. Sow seeds about 1 inch deep and 3-4 inches apart. Keep the soil consistently moist until seedlings emerge.

Snap peas need consistent moisture to produce those plump, juicy pods we all love. Here in the hot and humid Southeast, watering can be a bit of a balancing act. While we often get plenty of rainfall, especially during the summer afternoon thunderstorms, it's crucial to monitor your soil moisture.

During the spring and fall, when rainfall is less frequent, aim to water deeply about once a week, providing around 1 inch of water. Use the "finger test" – stick your finger about 2 inches into the soil. If it feels dry, it's time to water. In the hotter, more humid summer months, you might need to water more frequently, especially if we're experiencing a dry spell. 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 small, underdeveloped pods. 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 be careful not to mulch too heavily, as this can also contribute to fungal issues in our humid environment.

Snap peas are vining plants and need support to climb. Providing a trellis is essential for a healthy and productive crop. A simple string trellis, chicken wire stretched between posts, or even repurposed pea brush works well.

Install your support at planting time to avoid disturbing the roots later. Aim for a trellis that's 4-6 feet tall. As the vines grow, gently train them to climb the support, weaving the tendrils through the trellis as needed. This will help keep the plants off the ground, improving air circulation and reducing the risk of disease.

You can expect your first harvest of snap peas in the Southeast from mid April through mid November, about 60 days after planting. The best time to harvest is when the pods are plump and crisp, with fully developed peas inside. They should snap easily when bent.

Harvest snap peas regularly, every few days, to encourage continued production. Use scissors or pruning shears to cut the pods from the vine, being careful not to damage the plant. The more you harvest, the more the plant will produce. As the first frost approaches in early November, harvest any remaining pods, even if they are a little smaller than usual. You can blanch and freeze them for later use.

Here are some common problems you might encounter with snap peas in the Southeast:

• Powdery Mildew
• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi). This is a common issue in our Southeast summers.
• 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, often green, clustered on stems, leaves, and pods. They suck plant sap, causing distorted growth and yellowing.
• What causes it: Aphids are attracted to stressed plants and can multiply rapidly in warm weather. The Southeast's warm spring and summer provide ideal conditions for them.
• How to fix/prevent it: Strong blasts of water from a hose can dislodge aphids. Introduce beneficial insects like ladybugs and lacewings. Insecticidal soap or neem oil can be used for heavier infestations.
• Root Rot
• What it looks like: Yellowing leaves, stunted growth, and wilting, even with adequate watering. Roots are brown and mushy.
• What causes it: Fungi that thrive in waterlogged soil. Our clay soil and frequent summer rains can contribute to this problem.
• How to fix/prevent it: Improve soil drainage by amending with compost and other organic matter. Avoid overwatering. Plant in raised beds if drainage is poor.
• 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 combination of hot, humid summers and our clay soil can make growing snap peas a bit tricky. Be vigilant about monitoring for fungal diseases and ensure your soil is well-draining. Also, deer love to munch on pea plants, so consider fencing or deer repellent.

Companion planting can be a great way to improve the health and productivity of your snap peas. Carrots and radishes make excellent companions because they help loosen the soil, making it easier for pea roots to grow. Plus, radishes are a quick crop that can be harvested before the peas need the space. Cucumbers and corn provide natural support for the pea vines to climb.

Lettuce is another good companion, as it can help suppress weeds and provide shade to the soil, keeping the roots cool. Avoid planting snap peas near onions and garlic, as these can inhibit their growth. Onions and garlic produce allicin, which can stunt the growth of legumes like peas.