Pepperoncini in Zone 8A — Pacific Northwest

Pepperoncini peppers are worth growing in the Pacific Northwest. Their tangy, slightly sweet flavor adds a zing to salads, sandwiches, and antipasto platters. Plus, the satisfaction of pickling your own peppers from your garden is hard to beat, especially since our cool nights here in the PNW often intensify their flavor.

While we don't have the scorching summers of other regions, pepperoncini thrive here with a little planning. Our 203-day growing season gives us enough time to mature these peppers, especially when we give them a head start indoors.

Starting pepperoncini indoors from mid-February through mid-March gives them the warmth they need to get going before our wet springs arrive. Aim to start them about 8 weeks before you plan to transplant them outside. Use seed trays with a good seed-starting mix.

Keep your seed trays in a warm spot, ideally around 75-80°F. A heat mat can be very helpful, as our spring soil temperatures tend to stay cool. Once the seedlings emerge, provide them with plenty of light – a grow light works best, especially with our overcast spring days. Water from the bottom of the tray to encourage strong root growth and prevent damping off.

Transplant your pepperoncini seedlings outdoors from late April through late May, after the last expected frost. Before transplanting, harden off the seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the cooler temperatures and stronger sunlight.

Choose a sunny spot with well-drained soil, and space the plants 18-24 inches apart. Even in late April, be prepared for unexpected cool snaps. Covering the transplants with row cover can provide extra warmth and protection during those chilly nights.

Pepperoncini need moderate watering, especially during our dry summer months. In the Pacific Northwest, deep watering once or twice a week is usually sufficient, depending on rainfall. Use the finger test: stick your finger about 2 inches into the soil. If it feels dry, it's time to water.

Aim to provide about 1 inch of water per week, either through rainfall or irrigation. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid springs. Slightly wrinkled skin on the peppers is normal and not necessarily a sign of underwatering.

If the leaves are wilting and the soil is dry, you're underwatering. If the leaves are yellowing and the soil is soggy, you're overwatering. A layer of mulch around the base of the plants helps retain moisture and suppress weeds, which is especially helpful during our drier months.

Pepperoncini plants are relatively compact and bushy, so they rarely need support. However, if your plants become heavily laden with fruit, especially after a good soaking rain, you might consider providing some extra support.

Small tomato cages or individual stakes work well. Install the support at planting time to avoid disturbing the roots later. Simply guide the stems gently through the cage or tie them loosely to the stake as they grow.

Pruning pepperoncini is minimal, but a little attention can boost your harvest. Pinch off the first few 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 on.

Throughout the season, harvest peppers frequently. This encourages the plant to produce more fruit. As our first frost approaches in late October, you can remove any remaining flowers to encourage the plant to ripen the existing peppers.

You can expect your first harvest of pepperoncini from early July through late August. 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 red for a sweeter flavor.

To harvest, use sharp pruners or scissors to cut the peppers from the plant, being careful not to damage the stems. Regular harvesting encourages continuous production throughout the season. As the first frost approaches in late October, harvest all remaining peppers, even the green ones.

Green peppers will ripen indoors if stored in a warm, bright location. Place them in a paper bag with a ripe apple or banana to speed up the ripening process.

Here are some common problems you might encounter with pepperoncini in the Pacific Northwest:

Over-ripening

• What it looks like: Peppers become soft, wrinkled, and may develop dark spots.
• What causes it: Peppers left on the vine too long, especially in warm weather.
• How to fix/prevent it: Harvest peppers regularly as they reach the desired size and color. Check plants frequently during peak season.

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.

Pacific Northwest Specific Challenges: Our mild heat and dry-summer rainfall can actually be beneficial for pepperoncini, reducing the risk of blossom drop due to excessive heat. However, late blight can be a concern in our region, so choose blight-resistant varieties if possible and provide good air circulation. Slugs can also be a nuisance, especially early in the season, so use appropriate control measures.

Good companions for pepperoncini include tomatoes, basil, carrots, and onions. Tomatoes provide shade and support, while basil repels pests and improves flavor. Carrots loosen the soil, and onions deter certain insects.

Avoid planting pepperoncini near fennel or brassicas like cabbage and broccoli. Fennel inhibits the growth of many plants, and brassicas can attract pests that also affect peppers. Companion planting can help create a healthier, more productive garden in the Pacific Northwest.