Snow Peas in Zone 7B — Northern California

Snow Peas are a real treat in a NorCal garden. Their crisp, sweet pods are delicious raw, stir-fried, or added to salads, and they're one of the first fresh veggies you can harvest in spring. Plus, they thrive in our Mediterranean climate, offering harvests from late spring all the way through fall.

We NorCal gardeners know about drought and unpredictable weather, but don't let that scare you off. With a little planning, you can easily grow snow peas. Our long 245-day growing season gives you plenty of time to get multiple crops in.

If you want to get a jump start, you can transplant snow peas outdoors from mid-February through mid-March. Harden off your seedlings by gradually exposing them to outdoor conditions for about a week before transplanting. This helps them adjust to the cooler temperatures and brighter sunlight.

Space your transplants about 3-4 inches apart. Keep an eye on the weather forecast, as late frosts are possible, but snow peas are fairly hardy. Be ready to cover them if a cold snap threatens.

Direct sowing is the preferred method for snow peas, and it's easy! You can sow seeds directly into the garden from early February through early September. This long window takes advantage of our mild winters and extends your harvest well into the fall.

Prepare your soil by loosening it and adding compost. Snow peas like well-drained soil. Sow seeds about 1 inch deep and 3-4 inches apart. Keep the soil consistently moist until they germinate. Just like garden peas, direct sow in early spring for best results.

Snow peas need consistent moisture to thrive, especially during flowering. In our dry NorCal summers, this means paying close attention to your watering schedule. While they don't love being waterlogged, they'll bolt if they dry out too much.

During the cooler spring and fall months, water deeply once or twice a week, providing about 1 inch of water. As temperatures rise in summer, increase watering to 2-3 times a week, giving them about 1-1.5 inches of water each time. Use the finger test: stick your finger about 2 inches into the soil. If it feels dry, it's time to water. Water at the base of the plants rather than overhead to minimize fungal diseases. A layer of mulch will help retain soil moisture and keep the roots cool during our moderate-to-hot summers.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. Adjust your watering schedule as needed to keep your snow peas happy.

Snow peas are vines and need support to climb. A simple trellis made of string, netting, or wire works great, especially since their vines are lighter than snap peas. You can even use branches stuck in the ground for a rustic look.

Install the support at planting time, so the peas have something to grab onto as they grow. Gently guide the vines towards the support as they develop. They'll naturally start to climb on their own.

You can expect your first harvest of snow peas from late March through late November, about 55 days after planting. The key is to harvest when the pods are flat and you can just barely see the pea outlines inside. The pods should be translucent and crisp, not bulging.

To harvest, gently snap the pods off the vine, being careful not to damage the plant. Regular harvesting encourages continued production. As our first frost approaches in mid- November, harvest any remaining pods, even if they're a little small, to get the most out of your plants.

Here are some common problems you might encounter with snow peas in Northern California:

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 green insects clustered on stems, leaves, and pods. Leaves may be distorted or yellowed. Sticky honeydew can attract ants.
• What causes it: Aphids thrive in mild weather and can quickly multiply.
• 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 also be effective.

Root Rot

• What it looks like: Yellowing leaves, stunted growth, and wilting, even when the soil is moist. Roots are brown, mushy, and may have a foul odor.
• What causes it: Overwatering or poorly drained soil creates conditions for fungal pathogens to thrive.
• How to fix/prevent it: Ensure well-draining soil. Avoid overwatering. Improve soil drainage by adding compost or other organic matter. Raise beds can also help.

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.

Northern California Specific Challenges: Our moderate-to-hot, dry summers and occasional drought conditions can stress snow peas, making them more susceptible to these problems. Consistent watering, good air circulation, and disease-resistant varieties are key to success.

Snow peas play well with others in the garden. Carrots are great companions because they help loosen the soil, making it easier for snow peas to grow. Radishes also help break up the soil and act as a trap crop for pests. Cucumbers provide shade, which can be beneficial during our warmer months. Corn acts as a natural trellis for snow peas to climb. Lettuce provides ground cover, helping to retain moisture in the soil.

Avoid planting snow peas near onions or garlic. These can inhibit the growth of snow peas. By choosing the right companions, you can create a thriving and productive garden.