Anaheim Pepper in Zone 3B — Mountain West

Anaheim peppers bring a taste of the Southwest to your Mountain garden, offering a mild heat and versatility that shines in our cool summer nights. Their thick walls make them perfect for roasting, stuffing, or adding a subtle kick to salsas – flavors that truly pop when grown under our intense mountain sun.

While our short 108-day growing season and high altitude present unique challenges, starting Anaheim peppers indoors and timing your transplant carefully ensures a rewarding harvest. You'll find that with a little planning, these peppers thrive here.

Start your Anaheim pepper seeds indoors in early to late April, about eight weeks before you plan to transplant them outside. This timing takes into account our late springs here in the mountains. Use seed trays with a good seed-starting mix, and make sure they're in a warm location, ideally with a heat mat underneath, and under grow lights.

Consistent moisture is key, and bottom watering is your friend. Place the tray in a shallow container of water and let the soil soak it up from the bottom. This prevents damping off and encourages strong root development.

Transplant your Anaheim pepper seedlings outdoors in early to mid June, once the danger of frost has passed. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. Start with an hour or two of shade, increasing the time and sun exposure each day.

Space the plants 18-24 inches apart in a sunny spot. Remember that even in June, we can get unexpected cold snaps here in the mountains, so keep an eye on the forecast and be ready to cover your young plants if needed.

Anaheim peppers need moderate watering, and while they were developed for hot, dry climates, our Mountain West conditions require a bit of finesse. During the peak of summer (if we get one!), aim for about 1 inch of water per week, delivered deeply. Use the finger test: stick your finger about 2 inches into the soil. If it feels dry, it's time to water.

Water at the base of the plant to avoid wetting the foliage, which helps prevent any potential fungal issues in our low-humidity environment. Consistent moisture is especially crucial during flowering and fruit development.

Mulch around your pepper plants with straw or wood chips to help retain moisture and regulate soil temperature. Signs of underwatering include wilting leaves and slow growth, while overwatering can lead to yellowing leaves and root rot.

Anaheim pepper plants can get quite tall and produce heavy fruit, so providing support is often a good idea. Staking is the easiest method. Use sturdy stakes made of wood or metal, inserting them into the ground near the base of the plant at planting time.

As the plant grows, gently tie the main stem to the stake with soft twine or plant ties. This will prevent the plant from toppling over, especially when loaded with peppers.

Pinching off the first few flowers that appear on your Anaheim pepper plants can encourage them to focus their energy on vegetative growth, resulting in a stronger plant and a larger overall yield. Do this early in the season, as soon as you see those first buds forming.

Otherwise, standard pepper maintenance applies: remove any yellowing or dead leaves. As the end of our short season approaches in late August, you can pinch off new flowers to encourage the plant to ripen the peppers that are already set.

You can expect your first Anaheim pepper harvest in late August through early September, about 75 days after transplanting. The peppers are ready to harvest green at 6-8 inches long for a milder flavor, or you can wait until they turn red for a bit more heat.

Gently twist or cut the peppers from the plant, being careful not to damage the branches. Regular harvesting encourages continued production. As the first frost approaches in early September, harvest any remaining peppers, even if they're still green. They will often ripen indoors if kept in a warm, sunny location.

Here are three common problems you might encounter with Anaheim peppers in our Mountain West gardens:

Blossom End Rot

• What it looks like: A sunken, dark brown or black leathery patch on the bottom of the pepper.
• What causes it: Calcium deficiency due to inconsistent watering. Our dry climate and alkaline soil can exacerbate this issue.
• How to fix/prevent it: Water consistently and deeply, especially during dry spells. Mulch heavily to maintain even soil moisture. Avoid over-fertilizing with nitrogen. Remove affected fruit.

Sunscald

• What it looks like: White, papery patches on the fruit exposed to direct sun.
• What causes it: Intense UV radiation on the fruit, especially if foliage is sparse. Our high altitude makes this a significant risk.
• How to fix/prevent it: Avoid over-pruning leaves. Use shade cloth during the hottest part of the day. If fruit is already exposed, drape a small piece of row cover over it.

Aphids

• What it looks like: Clusters of tiny insects (green, black, or white) on stems and leaf undersides. Sticky honeydew residue.
• What causes it: Rapid reproduction in warm weather. They love our intense sunlight.
• How to fix/prevent it: Strong water spray to knock them off. Encourage ladybugs. Insecticidal soap for heavy infestations. Avoid excess nitrogen.

Mountain West Specific Challenges: Our intense sun requires careful monitoring for sunscald. Consistent watering is crucial to combat blossom end rot in our dry climate. And keep an eye out for aphids, which can thrive in our sunny conditions.

Good companions for Anaheim peppers include tomatoes, basil, carrots, and onions. Tomatoes provide some shade, protecting the peppers from intense sun. Basil repels pests and improves flavor. Carrots loosen the soil, aiding drainage. Onions deter pests like aphids.

Avoid planting fennel or brassicas (like cabbage and broccoli) near your Anaheim peppers. Fennel inhibits growth, while brassicas compete for nutrients and attract pests that can also affect your peppers.