Cayenne Peppers in Zone 6B — Pacific Northwest

Cayenne Peppers bring a welcome kick to your Pacific Northwest garden. Their fiery flavor and versatility in the kitchen make them a rewarding crop, and the satisfaction of harvesting your own peppers after our mild summers is hard to beat. Plus, cool nights concentrate their heat, resulting in a truly flavorful pepper.

Growing warm-season crops like Cayenne Peppers in our Zone 6B climate presents some challenges, namely our cool springs and relatively short stretches of real heat. However, by starting seeds indoors and timing your transplant carefully, you can easily work within our 162-day growing season and enjoy a bountiful harvest.

Starting Cayenne Peppers indoors gives them a head start before the weather warms up. You'll want to sow your seeds mid-March through early April, about eight weeks before you plan to transplant them outdoors. Use seed trays or small pots filled with a good seed-starting mix.

Keep the soil consistently moist, but not soggy. Bottom watering is a great way to prevent damping off – just set the tray in a shallow dish of water and let the soil soak it up from the bottom. Place the trays in a warm spot, ideally with a heat mat, and provide plenty of light with grow lights, especially given our often overcast spring days.

Transplanting your Cayenne Peppers outdoors should happen mid-May through mid-June, after the danger of frost has passed and the soil has warmed up a bit. Before planting them directly into the ground, harden them off 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.

Plant your peppers 18-24 inches apart in a sunny spot. Keep an eye on the weather forecast, as late spring can still bring unexpected cool snaps. If a cold spell is predicted, cover your young plants with row covers or blankets to protect them.

Cayenne Peppers need consistent moisture, but they don't like to be waterlogged, which is especially important to remember during our wet springs here in the PNW. During the dry summer months, check the soil moisture regularly. Stick your finger about two inches deep – 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 plant to avoid wetting the foliage, which can encourage fungal diseases in our sometimes humid conditions. As the peppers begin to mature, slightly reducing watering can concentrate their heat and flavor.

Signs of underwatering include wilting leaves and stunted growth. Overwatering can lead to yellowing leaves and root rot. Applying a layer of mulch around the base of the plants helps to retain moisture and suppress weeds, which is especially helpful during our dry summer months.

While not always necessary, supporting your Cayenne Peppers can be beneficial, especially as the plants become laden with fruit. The upright growth habit and the weight of the peppers can cause the stems to bend or break, especially in windy conditions.

A simple stake works well. Insert the stake near the base of the plant at planting time to avoid damaging the roots later. As the plant grows, gently tie the main stem to the stake with soft twine or plant ties.

Pinching off the first few flowers that appear on your Cayenne Pepper plants encourages them to focus on vegetative growth early in the season. This results in a stronger, more productive plant later on.

Simply snip off the flowers as they appear, usually early in the season, before the plant is fully established. As the first frost approaches in early October, you can prune off any remaining flowers and small peppers to encourage the plant to focus its energy on ripening the existing fruit.

You can expect your first Cayenne Pepper harvest from late July through mid-September, about 70 days after transplanting. The peppers are ready to pick when they turn a bright red color, are 4-6 inches long, and have a slight wrinkle on their skin. They should snap off the stem easily with a gentle tug.

Harvesting regularly encourages the plant to produce more peppers. As the weather cools in late summer, keep an eye on the forecast. If a frost is predicted, harvest all remaining peppers, even if they are still green. They will ripen indoors if you place them in a paper bag with an apple or banana.

Here are a few common problems you might encounter with Cayenne Peppers in the Pacific Northwest:

Blossom Drop

• What it looks like: Flowers fall off the plant without setting fruit. Small fruit yellows and drops prematurely. The plant looks healthy but produces no peppers.
• What causes it: Temperature stress is a common culprit. Peppers don't set fruit well when nighttime temperatures stay above 75°F or daytime temperatures exceed 95°F, which is rare but possible here. Low humidity, excess nitrogen, or poor pollination can also contribute.
• How to fix/prevent it: Be patient – fruit set will often resume when temperatures moderate. Provide afternoon shade during unusually hot spells. Keep plants well-watered, but avoid over-fertilizing with nitrogen. Try hand-pollination by gently shaking the plant.

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 can explode in warm weather. Ant colonies may farm them for honeydew.
• How to fix/prevent it: A strong spray of water can knock them off. Encourage beneficial insects like ladybugs and lacewings, which are natural predators. Use insecticidal soap for heavy infestations. Neem oil also works well. Avoid excess nitrogen fertilizer, as it attracts them.

Pepper Weevils

• What it looks like: Small holes in pepper pods, often with larvae inside. Deformed or stunted peppers. Premature fruit drop.
• What causes it: Adult weevils lay eggs inside the pepper pods, and the larvae feed on the developing seeds and flesh.
• How to fix/prevent it: Inspect plants regularly for signs of weevil damage. Remove and destroy any infested peppers. Use row covers to prevent weevils from accessing your plants. Insecticides can be used, but be sure to follow label instructions carefully.

Bacterial Spot

• What it looks like: Small, circular, water-soaked spots on leaves, stems, and fruit. Spots may turn brown or black and have a yellow halo. Infected leaves may drop prematurely.
• What causes it: A bacterial disease that thrives in warm, humid conditions. It can spread through infected seeds, splashing water, and handling plants when they are wet.
• How to fix/prevent it: Use disease-free seeds. Avoid overhead watering. Space plants adequately to promote good air circulation. Remove and destroy infected leaves and fruit. Copper-based fungicides can help to control the spread of the disease.

Pacific Northwest Specific Challenges: Our mild summers and relatively dry air can actually be an advantage when it comes to growing Cayenne Peppers, as we don't often experience the high heat and humidity that can lead to many pepper diseases. However, late blight, which is common in our region, can affect peppers as well as tomatoes, so be sure to monitor your plants closely and take preventative measures if necessary.

Companion planting can help your Cayenne Peppers thrive. Tomatoes make great companions because they share similar growing requirements and can offer some shade during the hottest part of the day, which is helpful during our occasional heat waves. Basil is another good choice, as it repels aphids and other pests, plus it enhances the flavor of both peppers and tomatoes.

Carrots and onions are also beneficial companions because they deter soil-borne pests and improve soil health. Avoid planting fennel or kohlrabi near your Cayenne Peppers, as they can inhibit their growth.