Banana Peppers in Zone 6B — Pacific Northwest

Banana peppers are a fantastic addition to any Pacific Northwest garden. Their mild, slightly sweet flavor is delicious fresh, pickled, or grilled, and they thrive in our mild summers, producing a prolific harvest. Plus, the satisfaction of growing your own peppers, especially in a region sometimes considered marginal for warm-season crops, is incredibly rewarding.

While our cool nights and relatively short growing season (around 162 days) present some challenges, proper timing and a little extra care will ensure a bountiful crop of banana peppers. Starting indoors and choosing the right spot in your garden are key to success.

Starting your banana pepper seeds indoors is essential in the Pacific Northwest to get a head start on our relatively short growing season. Aim to sow your seeds mid-March through early April, about eight weeks before you plan to transplant them outdoors. This gives them ample time to develop into strong seedlings.

Use seed trays or small pots filled with a good quality seed-starting mix. Provide consistent warmth, ideally around 75-80°F, using a heat mat if needed. Once the seedlings emerge, they'll need plenty of light. A grow light is highly recommended, especially with our often overcast spring days. Remember to water from the bottom to avoid damping off – set the seed tray in a shallow dish of water and let the soil absorb moisture.

Transplant your banana pepper seedlings outdoors mid-May through mid-June, once the danger of frost has passed and the soil has warmed up. Before transplanting, harden off the seedlings by gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade and increase the time and sun exposure each day.

Choose a sunny spot in your garden with well-drained soil, spacing the plants 18-24 inches apart. Be mindful of potential late spring cold snaps. If a frost is predicted, cover the seedlings with row covers or blankets to protect them.

Banana peppers need consistent moisture, but they don't like to be waterlogged. In the Pacific Northwest, with our dry summer months, you'll likely need to water them more frequently than you would in other regions. However, be mindful of overwatering, especially during our wet springs.

A good rule of thumb is to water deeply when the top two inches of soil feel dry to the touch – the "finger test." During our mild summers, this usually translates to about 1-2 inches of water per week, depending on rainfall. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid environment.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. Mulching around the base of the plants with straw or wood chips helps retain moisture and suppress weeds, reducing the need for frequent watering.

Banana peppers can become quite prolific, laden with many long peppers, so a little support can go a long way. While not strictly necessary, staking or caging can prevent branches from breaking under the weight of the fruit.

The best time to install supports is at planting time to avoid disturbing the roots later. Simple bamboo stakes work well; just gently tie the main stem to the stake with soft twine. Alternatively, you can use tomato cages for more comprehensive support as the plant grows.

While banana peppers don't require extensive pruning, pinching off the first few flowers that appear can encourage the plant to focus its energy on vegetative growth, resulting in a stronger, more productive plant later in the season.

Do this early in the season, before the plant gets too large. Beyond that, regular harvesting is the best form of maintenance. As the first frost approaches in early October, you can remove any remaining small peppers to encourage the plant to focus on ripening the larger ones.

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

To harvest, use sharp pruners or scissors to cut the pepper from the plant, leaving a short stem attached. Regular harvesting encourages the plant to produce more peppers throughout the season. As the first frost approaches in early October, harvest any remaining peppers, even if they are still green. They will ripen indoors if stored in a paper bag with an apple or banana.

Here are some common problems you might encounter growing banana peppers in the Pacific Northwest:

• Blossom Drop
• What it looks like: Flowers fall off without setting fruit, or small fruit yellows and drops. The plant looks healthy otherwise.
• What causes it: Temperature stress is the main culprit. While our summers are mild, we can still have occasional heat waves that stress the plants. Low humidity or poor pollination can also contribute.
• How to fix/prevent it: Be patient – fruit set usually resumes when temperatures moderate. Provide afternoon shade during hot spells. Ensure consistent watering. Gently shake the plant to encourage pollination.
• Aphids
• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue and curled or distorted new growth.
• What causes it: These sap-sucking insects thrive in warm weather. Ant colonies often protect them.
• How to fix/prevent it: A strong blast of water from the hose can knock them off. Encourage beneficial insects like ladybugs. Insecticidal soap or neem oil can be used for heavy infestations.
• Flea Beetles
• What it looks like: Tiny round holes (shot-hole pattern) in leaves, especially on young seedlings. You'll see small, dark beetles that jump when disturbed.
• What causes it: These small jumping beetles feed on leaves, causing damage, especially to small plants.
• How to fix/prevent it: Row covers are effective for protecting seedlings. Delay planting until plants are larger. Neem oil can help.
• Bacterial Spot
• What it looks like: Small, circular, water-soaked spots on leaves that turn brown or black. Spots may have a yellow halo. Fruits can also be affected.
• What causes it: A bacterial disease that thrives in warm, humid conditions. Splashing water spreads the bacteria.
• How to fix/prevent it: Remove and destroy infected leaves. Avoid overhead watering. Improve air circulation by spacing plants properly. Copper-based fungicides can help prevent further spread.

Pacific Northwest Specific Challenges: Late blight can be a concern in our region, although it primarily affects tomatoes and potatoes, it can sometimes spread to peppers. Ensure good air circulation and avoid overhead watering to minimize the risk. Cool soil in spring can also slow growth, so be sure to wait until the soil has warmed up before transplanting. Slugs can also be a nuisance, especially for young plants, so use slug bait or other control methods.

Companion planting can be a great way to improve the health and productivity of your banana peppers. Tomatoes are good companions because they share similar growing requirements and can provide some shade during hot spells. Basil is another excellent choice, as it repels aphids and other pests.

Carrots and onions are also beneficial, as they can deter soil-borne pests. Avoid planting fennel near banana peppers, as it inhibits their growth. Kohlrabi is also best kept separate, as it can attract flea beetles.