Snow Peas in Zone 5B — Great Plains

Snow Peas are a fantastic addition to any Great Plains garden. Their crisp, sweet pods are delicious raw, stir-fried, or added to salads. Plus, they're one of the first crops you can harvest, offering a taste of spring after a long winter, and a second crop in the fall extending your season.

Our region's extreme weather can be challenging, but Snow Peas are surprisingly resilient if you time things right. With our 178-day growing season, you can easily squeeze in two harvests – one in spring and another in the fall.

You can transplant Snow Peas outdoors in late March through mid April. Starting indoors isn't really necessary, but if you do, make sure to harden off the seedlings for about a week before planting them out. Gradually expose them to the elements, starting with just an hour or two of outdoor time each day.

When transplanting, space the seedlings about 3-4 inches apart. Keep an eye on the forecast – those late-season cold snaps can still happen. Have some row covers on hand to protect your young plants if a freeze is predicted.

Direct sowing is the preferred method for Snow Peas, and it's what most Plains gardeners do. Sow seeds directly into the ground from early March through early August. For a fall harvest, aim for late July through late August.

Before planting, make sure your soil is loose and workable. Snow Peas prefer soil temperatures around 45-75°F for optimal germination. Plant seeds about 1 inch deep and 3-4 inches apart. Keep the soil consistently moist until the seedlings emerge. Just like garden peas, you'll want to get these in the ground as soon as the soil can be worked in the spring.

Snow Peas need consistent moisture, especially when they're flowering and producing pods. In the Great Plains, with our variable rainfall and hot summers, this can be a little tricky. Water deeply but less frequently, aiming for about 1 inch of water per week, depending on rainfall.

Stick your finger into the soil about 2 inches deep. 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 moderate-humidity conditions. Overhead watering is fine, but do it in the morning so the leaves have time to dry out before nightfall.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. A layer of mulch, like straw or shredded leaves, can help retain moisture and keep the soil cool during those hot summer months.

Snow Peas are vines and need support to climb. A simple trellis works wonders, and because they're lighter than snap peas, you don't need anything too elaborate. A string trellis, netting, or even just some sturdy branches stuck in the ground will do the trick.

Install the support at planting time, so the plants can start climbing as soon as they emerge. Gently train the vines to climb the trellis, and they'll take it from there. Remember, wind protection is essential in the Plains. Position your trellis in a spot that's sheltered from the strongest winds to prevent damage to the vines.

You can expect your first harvest of Snow Peas in early May if you planted early, and continue harvesting through late October if you stagger your plantings. Snow Peas are usually ready about 55 days after planting.

Harvest the pods when they are flat, and you can just barely see the pea outlines inside. They should be translucent and crisp. Snap the pods off the vine carefully, being sure not to damage the plant. Regular harvesting encourages continued production.

As the first frost approaches in mid- October, harvest all remaining pods, even if they're a little small. They're still delicious! You can also succession plant every few weeks to extend your harvest season.

Here are some common problems you might encounter with Snow Peas in the Great Plains:

Powdery Mildew

• What it looks like: White or grayish powdery coating on leaves, stems, and sometimes fruit. Leaves curl, yellow, and die. Reduces plant vigor.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Dry leaf surfaces actually favor it (unlike most fungi).
• 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 clustered on stems and leaves, often causing yellowing or distortion. Sticky honeydew may be present.
• What causes it: Aphids thrive in warm weather and can quickly multiply. They suck sap from the plants, weakening them.
• How to fix/prevent it: Blast aphids off with a strong stream of water. Introduce beneficial insects like ladybugs and lacewings. Insecticidal soap or neem oil can also be effective.

Root Rot

• What it looks like: Yellowing and wilting leaves, stunted growth, and mushy, brown roots.
• What causes it: Overwatering and poorly drained soil create conditions favorable for fungal pathogens that cause root rot.
• How to fix/prevent it: Improve soil drainage by adding compost or other organic matter. Avoid overwatering. Plant in raised beds if drainage is a persistent problem.

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.

Great Plains Specific Challenges: The hot summers in the Plains can cause Snow Peas to bolt (go to seed) quickly, especially if they're not kept well-watered. The variable rainfall can also make it difficult to maintain consistent moisture levels. Watch your plants closely and adjust your watering schedule as needed.

Companion planting can really help your Snow Peas thrive. Carrots and radishes are good companions because they help loosen the soil, making it easier for Snow Peas to establish their roots. Cucumbers and corn provide shade, which can be beneficial during our hot summers. Lettuce is another good choice because it doesn't compete for the same nutrients.

Avoid planting Snow Peas near onions or garlic. These plants can inhibit the growth of peas.