Cubanelle Pepper in Zone 7A — Pacific Northwest

Cubanelle peppers are a fantastic choice for PNW gardens. Their mild, sweet flavor is perfect for frying, stuffing, or adding a touch of sweetness to your dishes. The satisfaction of harvesting your own peppers, especially in our mild summers and cool nights that enhance their flavor, is hard to beat.

While we might not have the blazing heat of other regions, our long, mild fall and careful timing make growing Cubanelles achievable. Our 183-day growing season gives you ample time to bring these peppers to harvest, especially if you start them indoors.

Start your Cubanelle pepper seeds indoors from early to late March, about eight weeks before the last expected frost. Use seed trays with a good quality seed starting mix. Maintaining a soil temperature of around 80°F (a heat mat helps!) is key for germination.

Place the trays in a location where they'll receive plenty of light. A sunny windowsill can work, but supplemental grow lights are really helpful in the PNW, especially with our overcast spring days. Water gently from the bottom to avoid damping off.

Bottom watering is easy: just set the seed tray in a shallow dish of water and let it soak up moisture for a few minutes. This encourages strong root growth early on.

Transplant your Cubanelle pepper seedlings outdoors from early May through early June, once the danger of frost has passed and the soil has warmed up a bit. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade and increase the time each day.

Space your plants 18-24 inches apart in a sunny spot with well-drained soil. Keep an eye on the weather forecast, as we can still get chilly spells in the spring. If a late frost is predicted, cover your seedlings with frost blankets.

Cubanelle peppers need moderate watering to thrive, especially during our dry summer months. While they're not drought-tolerant, you also don't want to overwater and risk root rot. The key is to find the right balance.

During the wet springs, you likely won't need to water much at all. But once the dry summer kicks in, check the soil moisture regularly. 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, either from rainfall or irrigation.

Water at the base of the plants to avoid getting the foliage wet, which can encourage fungal diseases. Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. Mulching around your plants with straw or wood chips helps retain moisture and keep the soil cool.

Cubanelle peppers have a bushy growth habit and can benefit from a little support, especially when they're laden with fruit. While not strictly necessary, light staking can prevent branches from breaking.

The best approach is to use bamboo stakes or tomato cages. Install them at planting time to avoid disturbing the roots later on. Gently tie the pepper plant to the stake as it grows, using soft twine or plant tape. This will keep the plant upright and prevent the peppers from touching the soil.

Pruning Cubanelle peppers is fairly simple. The main thing is to pinch off any early flowers that appear before the plant is well-established. This encourages the plant to focus on vegetative growth, resulting in a stronger, more productive plant later in the season.

Throughout the season, remove any yellowing or dead leaves to improve air circulation and prevent disease. These plants are productive and respond well to regular harvesting. As we approach mid- October and the first frost, remove any remaining small peppers that are unlikely to ripen in time.

You can expect your first harvest of Cubanelle peppers from mid July through late August, about 70 days after transplanting. Look for peppers that are pale yellow-green, thin-walled, and about 4-6 inches long. They should feel firm to the touch.

To harvest, use sharp scissors or pruning shears to cut the pepper from the plant, leaving a short stem attached. Be careful not to damage the plant or surrounding peppers. Regular harvesting encourages the plant to produce more peppers.

As the first frost approaches in mid- October, harvest all remaining peppers, even the green ones. They can ripen indoors if stored in a cool, dark place.

Here are some common problems you might encounter with Cubanelle peppers in the PNW:

Thin Walls Bruise Easily

• What it looks like: Bruised or damaged spots on the peppers, especially during handling or transport.
• What causes it: The thin walls of Cubanelle peppers make them susceptible to bruising.
• How to fix/prevent it: Handle peppers gently during harvest and transport. Store them carefully to avoid bumping or crushing.

Aphids

• What it looks like: Clusters of tiny 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, and ants may farm them.
• How to fix/prevent it: Strong water spray knocks them off. Encourage ladybugs and lacewings. Use insecticidal soap or neem oil for heavy infestations. Avoid excess nitrogen fertilizer.

Blossom End Rot

• What it looks like: Sunken, dark brown or black leathery patch on the bottom (blossom end) of the fruit, often affecting the first fruits.
• What causes it: Calcium deficiency caused by inconsistent watering. It's a nutrient uptake problem triggered by drought/flood cycles.
• How to fix/prevent it: Water consistently. Mulch heavily to maintain even soil moisture. Don't over-fertilize with nitrogen. Remove affected fruit.

Pacific Northwest Specific Challenges: Late blight can be a concern in our region, especially during wet summers. Ensure good air circulation around your plants and consider using a copper fungicide preventatively. Cool soil in spring can slow growth, so be patient and wait until the soil has warmed up before transplanting. Our relatively short heat can limit fruit production, so starting indoors is essential. Slugs also love pepper plants, so use slug bait or traps to protect your crop.

Companion planting can help your Cubanelle peppers thrive in the PNW. Tomatoes make excellent companions because they share similar growing requirements. Basil repels pests and improves the flavor of peppers. Carrots attract beneficial insects that prey on aphids. Onions also deter pests and improve soil health.

Avoid planting fennel near your peppers, as it inhibits their growth. Brassicas like cabbage and broccoli can compete for nutrients and attract pests that also affect peppers.