Banana Peppers in Zone 7B — Pacific Northwest

Banana peppers are a fantastic choice for the Pacific Northwest garden. Their mild, slightly sweet flavor makes them incredibly versatile in the kitchen, perfect for pickling, adding to salads, or stuffing. Plus, there's nothing quite like the satisfaction of harvesting your own peppers after our cool spring weather finally gives way to our mild summers.

While we may not have the scorching heat of other regions, our 193-day growing season is usually long enough to enjoy a good harvest of banana peppers. Starting seeds indoors early and using a few simple techniques will help you overcome our cool spring soils and make the most of our mild summer temperatures.

Starting banana pepper seeds indoors from late February through mid March gives them a head start before transplanting into the garden. This is especially important in the PNW, where our spring weather can be slow to warm up. You'll want to aim for about 8 weeks before you plan to transplant them outdoors.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist (but not soggy) by bottom watering – set the tray in a shallow dish of water and let the soil soak it up. Provide warmth with a heat mat and plenty of light with grow lights to mimic the summer sun that is still months away.

Transplant your banana pepper seedlings outdoors from late April through late May, once the danger of frost has passed and the soil has warmed up a bit. Before transplanting, harden off the seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun, wind, and temperature changes.

Choose a sunny spot in your garden and space the plants 18-24 inches apart. Our overcast spring days can be tough on young transplants, so be sure to protect them from unexpected late frosts with row covers if needed.

Banana peppers need consistent moisture, but they don't like to be waterlogged. In our Pacific Northwest climate, where we have mild summers and dry-summer conditions, a good rule of thumb is to water deeply about once a week, or when the top two inches of soil feel dry to the touch. This is the "finger test" – stick your finger into the soil up to the second knuckle.

During our dry summer months, you might need to increase watering to about 1 inch of water per week, especially if the plants are loaded with fruit. Water at the base of the plant to avoid wetting the foliage, which can help prevent fungal diseases in our dry-summer humidity.

Signs of underwatering include wilting leaves and slow growth. Overwatering can lead to yellowing leaves and root rot. Mulching around the plants with straw or compost helps retain moisture and keeps the soil cool, which is especially beneficial during our mild summers.

While not strictly necessary, providing some support for your banana pepper plants can be beneficial, especially as they start producing a lot of fruit. The bush-like growth habit and heavy fruit load can sometimes cause the branches to droop or even break.

A simple stake or small tomato cage works well. Install the support at planting time to avoid disturbing the roots later on. Gently tie the branches to the stake as needed, using soft twine or plant ties.

Pruning banana peppers is relatively simple. Early in the season, pinch off the first few flowers to encourage the plant to focus on vegetative growth and develop a strong root system. This will lead to a more productive plant later on.

Throughout the growing season, regular harvesting is the best form of maintenance. As the first frost approaches in late October, you can remove any remaining flowers to encourage the plant to put its energy into ripening the existing fruit.

You can expect your first harvest of banana peppers from early July through late August, about 70 days after transplanting. The peppers are typically ready to harvest when they are pale yellow-green and about 6-8 inches long. However, you can harvest them at any stage from yellow to red, depending on your preference.

To harvest, use pruning shears or a sharp knife to cut the pepper from the plant, leaving a short stem attached. Regular harvesting encourages the plant to continue producing more peppers. As the first frost approaches in late October, harvest all remaining peppers, even if they are still green. They will ripen indoors if you store them in a paper bag with an apple or banana.

Blossom Drop

• What it looks like: Flowers fall off without setting fruit. Small fruit yellows and drops prematurely, even though the plant itself appears healthy.
• What causes it: Temperature stress is the main culprit. Our cool nights and occasional heat spikes during the summer can prevent proper pollination. Low humidity, excess nitrogen, or poor pollination can also contribute.
• How to fix/prevent it: Be patient; fruit set will usually resume when temperatures become more consistent. Provide afternoon shade during periods of intense heat. Ensure consistent watering and avoid over-fertilizing with nitrogen. Gently shake the plant or use a small brush to hand-pollinate the flowers.

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and the undersides of leaves. You might also notice a sticky residue called honeydew and curled or distorted new growth.
• What causes it: These sap-sucking insects reproduce rapidly, especially during warm weather. Ant colonies often protect them in exchange for the honeydew they produce.
• How to fix/prevent it: A strong spray of water from the hose can dislodge them. Encourage natural predators like ladybugs and lacewings. For heavy infestations, use insecticidal soap or neem oil. Avoid over-fertilizing with nitrogen, as it attracts aphids.

Flea Beetles

• What it looks like: Small, round holes (shot-hole pattern) in the leaves. You may also see small, dark beetles that jump when disturbed. Seedlings are most vulnerable.
• What causes it: These small jumping beetles feed on the leaves of various plants.
• How to fix/prevent it: Protect seedlings with row covers during the vulnerable stage. Delay planting until plants are larger and more resilient. Apply kaolin clay to coat the leaves or spray with neem oil. Interplant with basil or catnip to deter them.

Bacterial Spot

• What it looks like: Small, dark, water-soaked spots on leaves, stems, and fruit. Spots may have a yellow halo. Infected leaves may turn yellow and drop.
• What causes it: A bacterial disease that thrives in warm, humid conditions. Spread by splashing water, insects, and contaminated tools.
• How to fix/prevent it: Remove and destroy infected leaves and fruit. Avoid overhead watering. Improve air circulation by spacing plants properly. Disinfect pruning tools between uses. Copper-based fungicides can help prevent spread, but are most effective when applied early.

Pacific Northwest Specific Challenges: Our mild summer heat and dry-summer humidity can actually be beneficial for banana peppers, reducing the risk of some diseases common in hotter, more humid climates. However, our cool spring soils can slow down growth, and late blight, while more common in tomatoes, can occasionally affect peppers, so it's important to monitor your plants and take preventative measures.

Companion planting can be a great way to improve the health and productivity of your banana pepper plants. Tomatoes make excellent companions because they have similar growing requirements and can help protect each other from pests. Basil is another good choice, as it repels aphids and other insects while also attracting pollinators. Carrots and onions can also be helpful, as they deter soil-borne pests and improve soil health.

Avoid planting banana peppers near fennel or kohlrabi. Fennel inhibits the growth of many plants, while kohlrabi can attract pests that also affect peppers.