Bell Peppers in Zone 6B — Pacific Northwest

Bell Peppers are a rewarding addition to any Pacific Northwest garden. Their sweet flavor and crisp texture shine in summer dishes, and the satisfaction of harvesting colorful peppers from your own backyard is hard to beat. Plus, our cool nights really help develop their sweetness.

While we may not have the long, scorching summers of other regions, don't let that deter you. With a little planning and attention to timing, you can absolutely grow delicious Bell Peppers in our 162-day growing season. The key is to get a head start indoors and choose the right varieties.

Starting Bell Pepper seeds indoors is crucial in the PNW to get a jump on our relatively short growing season. Aim to sow your seeds mid-March through early April, about eight weeks before you plan to transplant them outside. This gives them plenty of time to develop into strong seedlings.

Use seed starting trays with a good quality seed starting mix. Provide consistent warmth (a heat mat is helpful) and plenty of light – a grow light is almost essential given our often overcast spring days. Bottom watering is a great way to keep the soil consistently moist without disturbing the delicate seedlings.

Remember that spring in the PNW can be slow to warm up, so be patient. Keep your seedlings indoors until all danger of frost has passed.

Transplant your Bell Pepper seedlings outdoors mid-May through mid-June, once the soil has warmed up and the risk of frost is gone. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Space your Bell Pepper plants 18-24 inches apart in a sunny spot that gets at least 6-8 hours of direct sunlight per day. Even in late May and early June, we can still get chilly nights, so keep an eye on the forecast and be prepared to cover your plants if necessary.

Bell Peppers need consistent moisture to produce thick-walled, flavorful fruit. In the Pacific Northwest, this means paying close attention to your watering schedule, especially during our dry summer months. Aim to keep the soil consistently moist, but not waterlogged.

A good rule of thumb is to water deeply once or twice a week, providing about 1-2 inches of water each time. Use the "finger test" to check soil moisture – if the top 2 inches of soil feel dry, it's time to water. It's usually best to water at the base of the plant to avoid wetting the foliage, which can encourage disease, even in our drier summers.

Signs of underwatering include wilting leaves and blossom drop. Overwatering can lead to yellowing leaves and root rot. Mulching around your plants with compost or straw can help retain moisture and regulate soil temperature.

While not always necessary, providing support for your Bell Pepper plants can be beneficial, especially as they become loaded with fruit. The weight of the peppers can sometimes cause branches to break or the entire plant to topple over.

A simple stake or tomato cage works well for supporting Bell Peppers. Install the support at planting time to avoid damaging the roots later. As the plant grows, gently tie the main stem to the stake or guide it through the cage.

Pruning Bell Peppers isn't essential, but it can help improve airflow and encourage fruit production. Early in the season, pinch off any early flowers to encourage the plant to focus its energy on vegetative growth.

Remove any fruit that touches the ground to prevent rot. You can also prune out some of the interior branches to improve airflow and reduce the risk of disease. As the end of the season approaches (around early October), you can remove any new flowers to encourage the plant to ripen the existing fruit before the first frost.

You can expect your first harvest of Bell Peppers in late July through mid-September, about 70 days after transplanting. Bell Peppers can be harvested at any stage of maturity, but the flavor is sweetest when they are fully ripe and have turned their mature color (red, yellow, or orange).

To harvest, use pruning shears or a sharp knife to cut the pepper from the plant, leaving a short stem attached. Regular harvesting encourages the plant to continue producing more fruit. As the first frost approaches in early October, harvest any remaining green peppers.

Green peppers will ripen indoors if stored in a cool, dark place.

Here are some common problems you might encounter while growing Bell Peppers in the Pacific Northwest:

Blossom End Rot

• What it looks like: A sunken, dark brown or black leathery patch on the bottom of the fruit.
• What causes it: Inconsistent watering leading to calcium deficiency. Our wet springs followed by dry summers can create these fluctuations.
• How to fix/prevent it: Water consistently, especially during dry spells. Mulch heavily to maintain even soil moisture. Remove affected fruit.

Blossom Drop

• What it looks like: Flowers fall off without setting fruit. Small fruit yellows and drops.
• What causes it: Temperature stress. Even our mild summer days can sometimes get too hot for good fruit set, especially if nighttime temperatures stay warm.
• How to fix/prevent it: Provide afternoon shade during heat waves. Keep plants well-watered.

Aphids

• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue and distorted new growth.
• What causes it: Rapid reproduction of sap-sucking insects, often encouraged by warm weather.
• How to fix/prevent it: Strong water spray to knock them off. Encourage ladybugs. Use insecticidal soap or neem oil.

Sunscald

• What it looks like: White, papery patches on fruit exposed to direct sun.
• What causes it: Intense sunlight on fruit, often after leaves are lost or removed.
• How to fix/prevent it: Don't over-prune foliage. Use shade cloth during heat waves.

Pacific Northwest Specific Challenges: Our mild summers and dry-summer humidity mean that blossom drop and sunscald are less severe than in hotter climates, but inconsistent watering remains a key challenge. Late blight, while more common on tomatoes, can occasionally affect peppers, so practice good garden hygiene. Slugs can also be a nuisance, especially for young seedlings.

Companion planting can be a helpful strategy for growing Bell Peppers in the Pacific Northwest.

Good companions include tomatoes (they share similar needs and can provide some shade for each other), basil (repels pests and attracts pollinators), carrots (their roots loosen the soil), onions (repel pests), and spinach (provides ground cover and suppresses weeds).

Avoid planting Bell Peppers near fennel (inhibits growth), kohlrabi (competes for nutrients), and brassicas like cabbage and broccoli (can attract similar pests). Planting the right companions can help create a healthier and more productive garden, even in our unique PNW climate.