Anaheim Pepper in Zone 4B — Mountain West

Anaheim peppers are a fantastic choice for the Mountain West gardener looking for a bit of mild heat and a ton of versatility. They’re perfect for roasting, stuffing, or adding a subtle kick to your favorite dishes. Plus, the satisfaction of harvesting your own peppers after a long winter is hard to beat, especially with the intense sun giving them excellent flavor.

Growing peppers at high altitude comes with its challenges – intense UV, alkaline soil, and our short growing season. But with a little planning and the right timing, you can definitely bring in a great harvest within our 128-day window.

Starting Anaheim peppers indoors is the way to go in our Zone 4B climate. You'll want to get your seeds going late March through mid April, roughly 8 weeks before you plan to transplant them outside. It seems early, but spring comes late here, and these peppers need a head start.

Use seed trays with a good seed-starting mix, and make sure they're in a warm spot, ideally around 75-80°F. A heat mat underneath can be a lifesaver. Give them plenty of light – a grow light is best, as our spring sunlight can still be pretty weak. Don't forget to water from the bottom to encourage strong root growth and prevent damping off.

Transplant your Anaheim peppers outdoors late May through late June, after the risk of frost has passed. Before planting them in the ground, harden them off. This means gradually exposing them to outdoor conditions for about a week, starting with just an hour or two of shade each day.

Plant them 18-24 inches apart in well-draining soil. Keep an eye on the weather forecast, even in late spring we can get some surprise temperature swings. A row cover can protect your young plants from unexpected late frosts or even hail, which is common in the mountains.

Anaheim peppers need consistent moisture, but they don't like to be waterlogged, which can be tricky in our dry climate. Aim for moderate watering throughout the growing season. A good rule of thumb is to check the soil about 2 inches deep – if it's dry to the touch, it's time to water.

In our Mountain West climate, with its low humidity and dry rainfall, you'll likely need to water deeply once or twice a week, providing about 1-2 inches of water each time. Water at the base of the plant to avoid wetting the foliage, which can lead to fungal issues, though that's less of a concern with our low humidity.

Watch for signs of underwatering, like wilting leaves, or overwatering, like yellowing leaves. Mulching around your pepper plants with straw or wood chips helps retain moisture and regulate soil temperature, which is especially helpful with our intense sun.

Anaheim peppers can get pretty tall and loaded with fruit, so providing some support is a good idea. Staking is a great option, especially if you're growing them in an exposed area where they might get buffeted by wind.

Install stakes at planting time, placing them a few inches away from the plant. As the pepper grows, gently tie the main stem to the stake with soft twine or plant ties. This will help prevent the branches from breaking under the weight of the peppers. Cages also work well, providing all-around support.

Pruning Anaheim peppers is fairly straightforward. Pinch off any early flowers that appear before the plant is a foot tall. This encourages the plant to focus on vegetative growth, resulting in a stronger plant and a bigger harvest later on.

Throughout the season, you can remove any yellowing or damaged leaves to improve airflow. As the first frost approaches in mid- September, consider removing any new flowers. The plant will then put its energy into ripening the existing peppers before the cold hits.

You can expect your first harvest of Anaheim peppers mid August through mid September, about 75 days after transplanting. They're ready to pick when they're 6-8 inches long and green. For a hotter flavor, let them ripen to red. The walls should be thick and firm.

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 produce more peppers. If a frost threatens before all your peppers are ripe, you can harvest them and bring them indoors to ripen.

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

Blossom End Rot

• What it looks like: A dark, sunken spot on the bottom of the pepper.
• What causes it: Inconsistent watering leads to calcium deficiency. Our dry climate and alkaline soil can exacerbate this.
• How to fix/prevent it: Water deeply and consistently. Mulch to retain moisture. Avoid over-fertilizing with nitrogen.

Sunscald

• What it looks like: White or tan papery patches on the pepper's surface.
• What causes it: Intense sun exposure, especially after leaves are lost. The high altitude and intense UV make this a risk.
• How to fix/prevent it: Avoid over-pruning. Use shade cloth during the hottest part of the day.

Aphids

• What it looks like: Clusters of tiny insects on stems and undersides of leaves, often with sticky honeydew.
• What causes it: Rapid reproduction in warm weather.
• How to fix/prevent it: Blast them off with a strong stream of water. Introduce ladybugs. Use insecticidal soap or neem oil.

Mountain West Specific Challenges: Our intense sun can lead to sunscald if plants aren't properly shaded. The low humidity, while generally beneficial for disease prevention, means you need to be extra vigilant about watering.

Companion planting can be really helpful in our Mountain gardens. Tomatoes are great companions for Anaheim peppers because they offer some shade, protecting the peppers from intense sun. Basil repels pests like aphids and whiteflies, and is just a great all-around garden helper. Carrots loosen the soil, improving drainage and aeration. Onions also deter pests and have antifungal properties.

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