Pepperoncini in Zone 6B — Mountain West

Pepperoncini peppers are a fantastic addition to any Mountain West garden. Their mild heat and tangy flavor make them perfect for pickling, adding to salads, or grilling alongside your favorite meats. Plus, their compact size makes them a great choice for smaller gardens, and the cool nights even in summer here enhance their flavor.

Our high altitude and short growing season present unique challenges, but don't let that deter you. With careful planning and attention to timing, you can successfully grow these delicious peppers. Our 163-day growing season is just long enough to get a great harvest if you start your seeds indoors.

Starting your Pepperoncini seeds indoors is essential in our climate because of the short season. Begin in early to late March, about 8 weeks before you plan to transplant them outdoors. This head start allows the plants to mature enough to produce a good yield before our first frost.

Use seed trays or small pots filled with a good quality seed-starting mix. Keep the soil consistently moist but not soggy; bottom watering is an excellent technique to avoid damping off. Place the trays in a warm location, ideally around 75-80°F, and provide plenty of light – a grow light works wonders, as our spring weather can be unpredictable.

Keep in mind that spring can be late in the Mountain West, so be patient and don't rush the process. A little extra attention during these early weeks will pay off big time later in the season.

Transplant your Pepperoncini seedlings outdoors from early May through early June, after the danger of frost has passed. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This will help them adjust to the intense sun and cooler temperatures of our region.

Choose a sunny spot in your garden with well-draining soil. Space the plants 18-24 inches apart to allow for adequate growth. Be prepared for unexpected late frosts; have row covers or blankets handy to protect your young plants if temperatures dip.

Watering Pepperoncini correctly is crucial in our dry Mountain West climate. While they need consistent moisture, they aren't drought-tolerant, and overwatering can be just as detrimental. The key is to find the right balance.

During the peak of summer, when temperatures are moderate-at-altitude, aim to water deeply about once a week, providing around 1 inch of water. Use the finger test: stick your finger about 2 inches into the soil. If it feels dry, it's time to water. In our low humidity, watering at the base of the plant is preferable to overhead watering, which minimizes fungal issues.

Slightly wrinkled skin on the peppers is normal and not necessarily a sign of underwatering. Watch for yellowing leaves or stunted growth, which can indicate either overwatering or underwatering. Mulching around the base of the plants with straw or wood chips helps retain moisture and regulate soil temperature.

Pepperoncini plants typically have a bush growth habit and are fairly compact, so they often don't require support. However, if your plants become heavily laden with peppers, especially after a rainstorm, you might want to provide some extra support to prevent branches from breaking.

Simple tomato cages or sturdy stakes work well. Install them at planting time to avoid disturbing the roots later. Gently tie the branches to the support as needed, using soft twine or plant ties.

Pruning Pepperoncini is a simple process that can boost your harvest. The main strategy is to pinch off the early flowers that appear on the plant. This encourages the plant to focus its energy on vegetative growth, resulting in a stronger, more productive plant later in the season.

Continue to harvest peppers frequently throughout the season to encourage continuous production. As the first frost approaches around early October, you can remove any remaining flowers to direct the plant's energy into ripening the existing peppers.

You can expect your first Pepperoncini harvest from mid-July through early September, depending on when you transplanted them. The peppers are ready to harvest when they are yellow-green and about 2-3 inches long – perfect for pickling! You can also let them ripen to a full red color for a sweeter, milder flavor.

To harvest, use pruning shears or scissors to cut the peppers from the plant, leaving a small stem attached. Avoid pulling the peppers off, as this can damage the plant. Harvesting frequently encourages the plant to produce more peppers.

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

Here are the top three problems you might encounter growing Pepperoncini in the Mountain West:

Over-ripening

• What it looks like: Peppers become soft, wrinkled, and develop dark spots. They may lose their vibrant color and become mushy.
• What causes it: Forgetting to harvest regularly, or leaving peppers on the vine too long in our intense sun, even though the temperature is moderate-at-altitude.
• How to fix/prevent it: Check your plants frequently and harvest peppers as they reach the desired size and color. Don't let them linger on the vine too long.

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. Ant colonies may farm them for honeydew.
• How to fix/prevent it: Strong water spray knocks them off. Encourage ladybugs and lacewings (natural predators). Insecticidal soap for heavy infestations. Neem oil works systemically. Avoid excess nitrogen fertilizer (it attracts them).

Blossom Drop

• What it looks like: Flowers fall off without setting fruit. Small fruit yellows and drops. Plant looks healthy but produces no fruit.
• What causes it: Temperature stress. Peppers and tomatoes don't set fruit well when nights stay above 75°F or days exceed 95°F. Also caused by low humidity, excess nitrogen, or poor pollination.
• How to fix/prevent it: Be patient — fruit set resumes when temperatures moderate. Provide afternoon shade during extreme heat. Keep plants well-watered. Avoid excess nitrogen. Try hand-pollination.

Mountain West Specific Challenges: Our moderate-at-altitude heat and low humidity can make blossom drop a common issue, especially during heat waves. Consistent watering and providing afternoon shade can help. Also, the dry air can exacerbate aphid infestations, so be vigilant and take action early.

Companion planting can benefit your Pepperoncini in the Mountain West.

Good companions include:

• Tomatoes: They thrive in similar conditions and don't compete for nutrients.
• Basil: It repels pests like aphids and whiteflies, and is said to improve the flavor of peppers.
• Carrots: They loosen the soil, improving drainage, and their feathery foliage attracts beneficial insects.
• Onions: They deter pests with their strong scent and don't compete for resources.

Avoid planting Pepperoncini near:

• Fennel: It inhibits the growth of many plants, including peppers.
• Brassicas (cabbage, broccoli, kale): They can attract pests that also affect peppers, and they compete for the same nutrients.