Banana Peppers in Zone 6B — Mountain West

Banana peppers are a rewarding addition to any Mountain West garden. Their mild, slightly sweet flavor and versatility in the kitchen make them perfect for everything from pickling to stuffing. Plus, their bright color adds a cheerful touch to your garden, and the cool nights even in summer can actually enhance their flavor.

Our high altitude and short growing season here in Zone 6B can present some challenges, but with a little planning and the right timing, you can absolutely enjoy a bountiful harvest of banana peppers. With our 163-day growing season, starting indoors and choosing the right varieties will give you a head start.

Starting your banana pepper seeds indoors is essential in the Mountain West, giving them a head start against our short growing season. Aim to sow your seeds early to late March, about eight weeks before the last expected frost. This timing is key, as our spring weather can be unpredictable.

Use seed trays or small pots filled with a good quality seed-starting mix. Keep the soil consistently moist, but not soggy. Bottom watering works great – set the tray in a shallow dish of water and let the soil absorb it from below. Place the trays in a warm location, ideally around 75-80°F, and provide plenty of light. A grow light is especially helpful in our region, where spring days can still be cloudy.

Transplant your banana pepper seedlings outdoors early May through early June, once the danger of frost has passed and the soil has warmed up. Before transplanting, be sure to harden off your seedlings by gradually exposing them to outdoor conditions over about a week. This helps them adjust to the intense sun and cooler temperatures common in the Mountain West.

Choose a sunny spot in your garden with well-drained soil. Space the plants 18-24 inches apart to allow for good air circulation. Keep an eye on the weather forecast and be prepared to cover the plants if a late frost threatens, as these peppers are tender.

Banana peppers need consistent moisture, but they don't like to be waterlogged, which is a balance you need to strike in our dry Mountain climate. During the hottest part of summer, you'll likely need to water them deeply a couple of times a week. Reduce watering frequency as temperatures cool down in late summer and early fall.

The "finger test" is a good way to gauge moisture levels. Stick your finger about two inches into the soil near the base of the plant. If it feels dry, it's time to water. Aim for about 1-2 inches of water per week, delivered at the base of the plant to minimize water loss through evaporation in our low humidity.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. A layer of organic mulch, like straw or wood chips, can help retain moisture in the soil and regulate soil temperature, especially important with our intense sun.

While not always necessary, providing some support to your banana pepper plants can be beneficial, especially as they become laden with fruit. These plants are prolific, and the weight of the peppers can sometimes cause the branches to break or droop.

Light staking is usually sufficient. You can use bamboo stakes or tomato cages to provide support. Install the stakes at planting time to avoid disturbing the roots later. Gently tie the branches to the stakes as needed, using soft twine or plant ties.

Pruning banana peppers is minimal but can encourage better fruit production. Pinching off the first few flowers that appear on the plant can direct its energy towards vegetative growth, resulting in a stronger plant and a larger harvest later in the season.

Throughout the growing season, regularly harvest the peppers as they ripen. This encourages the plant to continue producing more fruit. As the first frost approaches in early October, you can remove any remaining flowers to encourage the plant to focus on ripening the existing peppers.

You can expect your first harvest of banana peppers starting in mid July through early September, depending on when you transplanted them and how warm the summer is. The peppers are typically ready to harvest about 70 days after transplanting.

Look for peppers that are pale yellow-green and 6-8 inches long. You can harvest them at any stage of ripeness, from yellow to red, depending on your preference. Use pruners or scissors to cut the peppers from the plant, leaving a short stem attached.

Regular harvesting encourages continuous production. As the first frost approaches, harvest all remaining peppers, even the green ones. You can ripen them indoors by placing them in a paper bag with a ripe apple or banana.

Here are some common problems you might encounter with banana peppers in the Mountain West:

Blossom Drop

• What it looks like: Flowers fall off without setting fruit. Small fruit yellows and drops. The plant looks healthy but produces no fruit.
• What causes it: Temperature stress is the main culprit. Here in the Mountain West, our cool nights and occasional extreme heat during the day can disrupt fruit set. Low humidity and poor pollination can also contribute.
• How to fix/prevent it: Be patient; fruit set usually resumes when temperatures moderate. Provide afternoon shade during heat waves. Keep plants well-watered. Try hand-pollination by gently shaking the plant.

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: Rapid-reproducing sap-sucking insects thrive in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: Strong water spray knocks them off. Encourage ladybugs and lacewings. Use insecticidal soap for heavy infestations. Avoid excess nitrogen fertilizer.

Flea Beetles

• What it looks like: Tiny round holes (shot-hole pattern) in leaves. Small dark beetles that jump when disturbed. Worst damage to young seedlings.
• What causes it: Small jumping beetles that feed on leaves. Most damaging to small, young plants.
• How to fix/prevent it: Row covers protect seedlings. Delay planting until plants are larger. Use kaolin clay coating. Interplant with basil or catnip.

Bacterial Spot

• What it looks like: Small, water-soaked spots on leaves that turn brown and eventually fall out. Spots may also appear on fruit.
• What causes it: A bacterial disease that spreads through splashing water and infected seeds. Warm, humid conditions favor its development, though it can still occur in our drier climate.
• How to fix/prevent it: Use disease-free seeds. Avoid overhead watering. Remove and destroy infected leaves. Apply copper-based fungicide as a preventative measure.

Mountain West Specific Challenges: Our intense sun can exacerbate blossom drop, so providing afternoon shade is crucial. Low humidity helps reduce the risk of fungal diseases, but it also means you need to be diligent about watering. Be prepared for sudden temperature swings and protect your plants accordingly.

Companion planting can enhance the growth and flavor of your banana peppers. Tomatoes make excellent companions, as they share similar growing requirements and can provide some shade during our intense summer sun. Basil is another great choice, as it repels pests like aphids and flea beetles, and is said to improve the flavor of peppers. Carrots and onions are also beneficial, as they deter soil-borne pests and don't compete for resources. Avoid planting fennel near your banana peppers, as it inhibits their growth. Kohlrabi can also be a poor companion, as it attracts pests that can also damage your peppers.