Banana Peppers in Zone 7A — Mountain West

Banana peppers are a fantastic choice for the Mountain West garden. Their mild sweetness and crisp texture make them incredibly versatile in the kitchen, perfect for pickling, stuffing, or adding a touch of zest to your favorite dishes. Plus, the satisfaction of harvesting your own peppers, intensified by our intense sun and cool nights that boost flavor, is hard to beat.

Our high altitude, short growing season, and alkaline soil present some challenges, but with a little planning, you can successfully grow these peppers. You have about 173 days, so timing your starts right is key to a productive harvest before the first frost.

Starting your banana pepper seeds indoors in early to late March gives them a crucial head start in our short season. You'll need seed trays, a good seed-starting mix, and a warm location, ideally around 75-80°F. A heat mat can be helpful.

Consistent moisture is key, and bottom watering helps prevent damping off. Place your seed trays in a shallow container of water and allow the soil to soak up the moisture from the bottom. Once seedlings emerge, ensure they receive plenty of light – a grow light is ideal, especially considering our late spring.

Transplant your banana pepper seedlings outdoors from early May through early June, once the danger of frost has passed. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the intense sun and cooler nights.

Space your plants 18-24 inches apart to allow for adequate airflow and sunlight penetration. Even though May is usually mild, be prepared to cover your plants if a late frost threatens; our weather can be unpredictable.

Banana peppers need consistent moisture, but they don't like to be waterlogged, making them fairly low-maintenance. In our dry Mountain West climate, you'll likely need to water deeply about twice a week during the peak of summer.

Use the "finger test" to check soil moisture: stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. Aim for about 1-2 inches of water per week, depending on rainfall. Water at the base of the plants to avoid wetting the foliage, which can lead to fungal issues in other regions, though it's less of a concern with our low humidity.

Wilting leaves are a sign of underwatering, while yellowing leaves and stunted growth can indicate overwatering. A layer of organic mulch, like straw or wood chips, will help retain moisture and regulate soil temperature, which is essential in our intense sun.

Banana peppers are prolific producers, and the weight of the peppers can sometimes cause the branches to droop or even break. While not essential, light staking can provide the support they need to stay upright and healthy.

A simple tomato cage or individual stakes work well. Install the support at planting time to avoid disturbing the roots later. As the plant grows, gently tie the branches to the support using soft twine or plant tape.

Pruning banana peppers is minimal, but pinching off the first few flowers can encourage the plant to focus its energy on vegetative growth, leading to a more robust plant and a larger harvest later in the season. Do this early in the season, when the plant is still young.

Regular harvesting is also a form of maintenance, as it encourages the plant to continue producing. As the first frost approaches in early October, remove any remaining flowers to encourage the plant to put its energy into ripening the existing peppers.

You can expect your first banana pepper harvest from mid July through late August, 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.

Gently twist or cut the peppers from the plant, being careful not to damage the branches. Regular harvesting will encourage continued production throughout the season. As the first frost approaches, harvest all remaining peppers, even the green ones. They will ripen indoors if stored in a warm, well-lit location.

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, especially nights above 75°F or days exceeding 95°F. Low humidity and poor pollination can also contribute.
• How to fix/prevent it: Be patient—fruit set resumes when temperatures moderate. Provide afternoon shade during extreme heat. Keep plants well-watered. Try hand-pollination.
• Aphids
• What it looks like: Clusters of tiny soft-bodied insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue. Curled or distorted new growth.
• What causes it: Rapid-reproducing sap-sucking insects. Populations explode in warm weather.
• How to fix/prevent it: Strong water spray knocks them off. Encourage ladybugs and lacewings. Insecticidal soap for heavy infestations. Neem oil works systemically.
• Flea Beetles
• What it looks like: Tiny round holes (shot-hole pattern) in leaves. Small dark beetles that jump when disturbed.
• What causes it: Small jumping beetles that feed on leaves, especially damaging to young plants.
• How to fix/prevent it: Row covers protect seedlings. Delay planting until plants are larger. Kaolin clay coating. Neem oil spray.
• Bacterial Spot
• What it looks like: Small, dark, water-soaked spots on leaves and fruit, often with a yellow halo. Spots may merge and cause defoliation.
• What causes it: A bacterial disease that thrives in warm, humid conditions.
• How to fix/prevent it: Remove and destroy infected leaves. Improve air circulation. Avoid overhead watering. Copper-based fungicides can help prevent spread.

Mountain West Specific Challenges: Our moderate-at-altitude heat, low humidity, and dry conditions generally help reduce disease pressure on banana peppers. However, the intense UV radiation can stress plants, making them more susceptible to pests and diseases. Providing afternoon shade and ensuring adequate watering can help mitigate these effects. Hail can also be a concern, so consider using netting if hailstorms are frequent in your area.

Companion planting can enhance the growth and productivity of your banana peppers. Tomatoes make excellent companions because they share similar growing requirements and can provide mutual support. Basil repels many common pepper pests, while carrots and onions deter soil-borne nematodes.

Avoid planting banana peppers near fennel or kohlrabi. Fennel inhibits the growth of many plants, and kohlrabi can attract pests that also target peppers. Planting the right companions can create a healthier and more productive garden in our challenging Mountain West climate.