Snow Peas in Zone 6B — 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. They're also incredibly rewarding to grow. Plus, they're one of the first crops you can harvest in the spring and one of the last in the fall, making them a great way to extend your growing season.

We all know our region can throw some extreme weather our way, from spring temperature swings to summer heat and the occasional hail. But with our 198-day growing season, we have a good window to get several snow pea crops in. Careful timing and a little planning will help you enjoy a bountiful harvest.

You can transplant snow peas outdoors in the Great Plains from mid-March through early April. Starting seeds indoors isn't really necessary since they direct sow so easily, but if you do, be sure to harden them off. Give them about a week of gradual exposure to the outdoors before planting them in their final spot.

Space your transplants 3-4 inches apart. Keep an eye on the weather forecast during this time. Late frosts are always a risk, so be prepared to cover your seedlings if temperatures dip too low.

Direct sowing is the preferred method for snow peas in the Great Plains. You can start sowing as early as late February and continue through mid-August for a fall crop. Snow peas are just like garden peas — they like cool soil, so early spring planting is ideal.

Prepare your soil by loosening it and adding compost. Sow seeds about 1 inch deep and 3-4 inches apart. Keep the soil consistently moist until germination.

Snow peas need moderate watering, especially during flowering. They aren't drought-tolerant, so consistent moisture is key, especially with our variable rainfall here on the Plains. They're a cool-season crop, so the summer heat can cause them to bolt (go to seed), which reduces pod production.

In the spring and fall, when temperatures are cooler, aim for about 1 inch of water per week, either from rainfall or irrigation. During the hotter summer months, you might need to increase that to 1.5-2 inches per week. The "finger test" is your friend: 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 disease in our low-to-moderate humidity.

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, will help retain moisture in the soil and regulate soil temperature, which is especially helpful during our extreme temperature swings.

Snow peas are vines and need support to grow properly. A simple trellis made of string, netting, or even branches works well. Since snow peas have lighter vines than snap peas, you don't need anything too heavy-duty.

Install your support system at planting time so the vines can start climbing right away. Gently train the vines to climb the trellis as they grow. Wind protection is essential on the Plains, so consider positioning your trellis in a spot that's sheltered from strong winds.

You can expect your first snow pea harvest in late April if you plant early, and continue harvesting through early November if you get a late summer crop going. Snow peas are ready to harvest about 55 days after planting. Look for flat pods where you can just barely see the pea outlines inside. They should be translucent and crisp.

Harvest by gently snapping 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 if they're not quite fully mature. They'll still be tasty.

Here are a few 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). This can be an issue with our temperature swings.
• 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 near new growth. Leaves may be distorted or yellowed. Sticky honeydew may be present.
• What causes it: Aphids are attracted to stressed plants. Hot, dry conditions can exacerbate infestations.
• How to fix/prevent it: Blast aphids off plants with a strong stream of water. Introduce beneficial insects like ladybugs and lacewings. Insecticidal soap or neem oil can be effective.

Root Rot

• What it looks like: Yellowing leaves, stunted growth, and wilting, even with adequate watering. Roots are brown and mushy.
• What causes it: Overwatering and poorly draining soil create conditions favorable for fungal pathogens. Heavy clay soils, common in some parts of the Plains, can contribute.
• How to fix/prevent it: Ensure good soil drainage. Amend heavy clay soils with compost. Avoid overwatering. Plant in raised beds if necessary.

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: Our hot summers and variable rainfall can stress snow peas, making them more susceptible to pests and diseases. Consistent watering and good soil drainage are key to keeping your plants healthy and productive. Wind can also be a factor, so provide adequate support and consider windbreaks.

Companion planting can really boost your snow pea crop in the Plains. Carrots are great companions because they loosen the soil, which helps with drainage. Radishes also help break up the soil and deter pests. Cucumbers provide ground cover, which helps retain moisture, which is helpful in our variable climate. Corn can act as a natural trellis and provides some shade during the hottest part of the day. Lettuce benefits from the shade provided by snow peas, especially during our hot summers.

Avoid planting snow peas near onions and garlic. These plants can inhibit the growth of peas and beans.