Snap Peas in Zone 6B — Pacific Northwest

Snap peas are a fantastic addition to any Pacific Northwest garden. Their crisp, sweet pods are delicious raw, stir-fried, or added to salads. Plus, they are incredibly rewarding to grow yourself. The cool nights we get here actually enhance their sweetness!

While we may struggle with heat-loving plants sometimes, snap peas thrive in our mild summers. Our 162-day growing season gives you a generous window for planting and harvesting. Just watch out for those wet springs and plan accordingly.

You can transplant snap peas outdoors from early April through early May. Remember to harden them off for about a week before planting. Gradually introduce them to outdoor conditions to prevent shock.

Space the seedlings 3-4 inches apart. Give them plenty of room to climb.

Keep an eye on the weather. Those overcast spring days can still bring a late frost. Be prepared to cover your seedlings if temperatures dip.

Direct sowing is the preferred method for snap peas. You can start sowing mid-March through late July. They're pretty forgiving, like garden peas, so you can get them in the ground early.

Prepare your soil by loosening it and adding compost. Snap peas prefer soil temperatures above 40°F, so you might want to wait until the soil warms up a bit in mid-spring. Sow seeds 1 inch deep and 3-4 inches apart. Water gently but thoroughly after planting.

Snap peas need consistent moisture to produce plump, sweet pods. They aren't drought-tolerant, so don't let them dry out completely, especially during our dry summer months. But we also get plenty of rain, so be careful not to overwater.

In the spring, with our wet weather, you might not need to water at all. During the drier summer months, check the soil moisture regularly. Stick your finger about 2 inches deep. If it feels dry, it's time to water. Aim for about an inch of water per week, either from rainfall or irrigation.

Water at the base of the plants to avoid getting the foliage wet. This helps prevent fungal diseases in our sometimes humid conditions. Mulching around the base of the plants also helps retain moisture and suppress weeds. Wilting leaves are a sign of underwatering, while yellowing leaves and soggy soil indicate overwatering.

Snap peas are vining plants and need support to climb. A trellis is your best bet, providing vertical space and improving air circulation.

Install the trellis at planting time, so the peas can start climbing right away. A string trellis, chicken wire, or even repurposed pea brush works well. Aim for a support system that's 4-6 feet tall. As the peas grow, gently guide the tendrils towards the support. They'll grab on and start climbing on their own.

You can expect your first harvest of snap peas from mid-May through mid-October. That's a long harvest window thanks to our mild climate! Snap peas are usually ready about 60 days after planting.

Harvest when the pods are plump and crisp, with fully developed peas inside. The pods should snap easily when bent. Pick them young and tender for the best flavor. Use scissors or your fingers to gently snap off the pods, being careful not to damage the plant.

Regular harvesting encourages continued production. Keep picking those pods, and the plant will keep producing! As the first frost approaches in early October, harvest all remaining pods, even if they're not quite fully ripe. They'll still be delicious.

Here are some common issues you might encounter with snap peas in the Pacific Northwest:

Powdery Mildew

• What it looks like: A white or grayish powdery coating on the leaves, stems, and sometimes the pods. Leaves might curl, yellow, and eventually die.
• What causes it: Various fungi that thrive in warm days, cool nights, and moderate humidity. Surprisingly, dry leaf surfaces actually favor it.
• How to fix/prevent it: Improve air circulation by spacing plants properly and pruning if necessary. Remove affected leaves promptly. Neem oil or potassium bicarbonate sprays can help. A milk spray (1 part milk to 9 parts water) is also surprisingly effective. Plant resistant varieties if possible.

Pea Aphids

• What it looks like: Clusters of small, soft-bodied insects (usually green) on stems, leaves, and pods. Leaves may be distorted or yellowed.
• What causes it: These sap-sucking insects thrive in mild weather and can quickly multiply.
• How to fix/prevent it: Blast them off with a strong stream of water from your hose. Introduce beneficial insects like ladybugs. Insecticidal soap can be effective, but use it sparingly to avoid harming beneficials.

Root Rot

• What it looks like: Yellowing leaves, stunted growth, and wilting, even when the soil is moist. Roots are brown and mushy.
• What causes it: Overwatering and poorly drained soil create conditions for fungal pathogens to thrive.
• How to fix/prevent it: Ensure good drainage by amending heavy clay soils with compost. Avoid overwatering. Plant in raised beds if drainage is a persistent problem. Rotate crops to avoid buildup of soilborne pathogens.

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 the stem when cut open.
• What causes it: A soil-borne fungus (Fusarium oxysporum). Persists in the soil for years. Enters through the roots. Warmer soil temperatures favor it.
• How to fix/prevent it: There's 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.

Pacific Northwest Specific Challenges: Late blight, while more common on tomatoes and potatoes, can sometimes affect peas if conditions are right. Keep an eye out for lesions on leaves and stems. Also, slugs can be a major problem, especially in our wet springs. Use slug bait or traps to protect your seedlings.

Good companions for snap peas include carrots, radishes, cucumbers, corn, and lettuce. Carrots and radishes help break up the soil, making it easier for pea roots to grow. Cucumbers and corn provide support for the pea vines to climb. Lettuce provides ground cover, helping to retain moisture and suppress weeds.

Avoid planting snap peas near onions or garlic. These plants can inhibit pea growth.