Pepperoncini in Zone 7B — Pacific Northwest

Pepperoncini peppers are a fantastic addition to any Pacific Northwest garden. Their mild, tangy flavor is perfect for pickling, adding to salads, or enjoying fresh off the plant. The satisfaction of growing your own peppers, especially with the cool nights that enhance their flavor, makes them a worthwhile endeavor.

While the PNW presents some unique challenges, like cool soil in spring and the risk of late blight, pepperoncini are manageable with proper timing and care. Our roughly 193-day growing season, with its mild summers, offers ample opportunity to harvest a good crop.

Starting your pepperoncini seeds indoors in late February through mid March gives them a head start against our cooler spring weather. This head start is important, as we want to get them in the ground ready to produce as soon as our weather allows. You'll want to sow your seeds in seed trays with a good seed-starting mix, providing consistent warmth and plenty of light, either from a grow light or a sunny windowsill.

Consider bottom-watering your seed trays to keep the soil consistently moist without overwatering, especially during our overcast spring days. This encourages strong root development. Remember, our springs can be slow to warm up, so be patient and keep those seedlings cozy!

Transplant your pepperoncini seedlings outdoors in late April through late May, once the danger of frost has passed and the soil has warmed up a bit. Before planting, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sunlight and temperatures.

Space your plants about 18-24 inches apart in a sunny spot with well-drained soil. Even in late April, we can still get some chilly nights, so keep an eye on the forecast and be ready to cover your young plants if needed.

Pepperoncini peppers need consistent watering, but avoid overwatering, which can be a problem in our climate. During our wet springs, you may not need to water much at all. Let the rain do its job!

Once the dry summer months arrive, check the soil moisture regularly using the "finger test" – stick your finger about 2 inches deep into the soil. If it feels dry, it's time to water. Aim for about 1 inch of water per week, watering deeply at the base of the plant to avoid wetting the foliage and increasing the risk of fungal diseases.

Slightly wrinkled skin on the peppers is normal and doesn't necessarily mean they're underwatered. Overwatering can lead to root rot, so err on the side of caution. A layer of mulch around the base of the plants will help retain moisture during our dry summer months and suppress weeds.

Pepperoncini plants are generally compact and bushy, so they rarely need support unless they become heavily laden with fruit. If you find your plants are starting to lean or topple over, especially after a heavy rain, you can provide support using small tomato cages or stakes.

Install the supports at planting time to avoid damaging the roots later on. Gently tie the stems to the support as needed, using soft twine or plant ties.

Pruning pepperoncini is simple. Pinch off any early flowers that appear before the plant is well-established. This encourages the plant to focus on vegetative growth and develop a strong root system, leading to greater fruit production later on.

Throughout the season, harvest your peppers frequently. This encourages the plant to continue producing more fruit. As we approach the first frost in late October, you can remove any remaining flowers to encourage the plant to focus its energy on ripening the existing peppers.

You can expect your first pepperoncini harvest in early July through late August, about 72 days after transplanting. 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 red color for a sweeter flavor.

To harvest, use pruning shears or scissors to cut the pepper from the plant, leaving a small stem attached. Regular harvesting encourages continuous production throughout the season. As the first frost approaches in late October, harvest all remaining peppers, even if they are still green. You can ripen them indoors by placing them in a paper bag with a ripe banana or apple.

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

Over-ripening

• What it looks like: Peppers become soft, mushy, and wrinkled. They may develop dark spots or begin to rot on the plant.
• What causes it: Leaving peppers on the plant for too long after they reach their mature color.
• How to fix/prevent it: Harvest peppers regularly as they ripen. Check your plants every few days 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 don't set fruit well when nights stay consistently cool (below 60°F) or days exceed 90°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. While we rarely see temperatures above 90, be aware of the potential for blossom drop during heat spells.

Pacific Northwest Specific Challenges: Our mild heat can sometimes slow down pepper development, so starting indoors is key. The dry-summer humidity can exacerbate fungal issues like late blight, so ensure good air circulation and avoid overhead watering. Finally, protect young plants from slugs, which thrive in our damp spring conditions.

Companion planting can help your pepperoncini thrive! Tomatoes are great companions because they share similar growing requirements and can provide some shade during the hottest part of the day. Basil is another excellent choice, as it repels aphids and other pests.

Carrots and onions are also beneficial companions, as they deter soil-borne pests and improve soil health. Avoid planting pepperoncini near fennel, as it inhibits pepper growth. Brassicas like cabbage and broccoli can also compete for nutrients and attract pests that may also target your peppers.