Anaheim Pepper in Zone 6A — Mountain West

Anaheim peppers are a fantastic choice for the Mountain West garden. Their mild heat and versatility make them perfect for everything from roasting and stuffing to adding a subtle kick to salsas and stews. Plus, you'll find that the cool nights even in summer really concentrate their flavor, making your homegrown peppers taste even better than anything you can buy at the store.

High altitude gardening in the Mountain West comes with its own set of challenges, including our short season and intense sun. But with a little planning and the right timing, you can absolutely grow Anaheim peppers successfully here. Our 153-day growing season is just long enough to get a great harvest.

Starting your Anaheim pepper seeds indoors is the way to go in our climate. You'll want to get those seeds going mid-March through early April, about 8 weeks before you plan to transplant them outside. This gives them a head start to overcome our late spring.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, and consider bottom watering to prevent damping off. Place the trays in a warm spot, ideally around 75-80°F, and provide plenty of light, either with a grow light or a sunny (but not scorching) windowsill.

Transplant your Anaheim peppers outdoors mid-May through mid-June, once the danger of frost has passed. Before planting, you'll need to harden them off. This means gradually exposing them to outdoor conditions over about a week. Start with an hour or two of shade, then gradually increase the time and sun exposure each day.

When transplanting, space your plants about 18-24 inches apart in well-drained soil. Keep an eye on the weather forecast, as we can still get some chilly nights and even hail storms during this time. Use row covers for protection if needed.

Anaheim peppers need consistent moisture, but they don't like to be waterlogged. A moderate watering schedule is best, especially considering our low humidity and dry conditions here in the Mountain West. You'll want to water deeply but less frequently.

During the hottest part of the summer, when temperatures are around 85°F, aim for about 1 inch of water per week, either from rainfall or irrigation. Use the finger test to check soil moisture: stick your finger about 2 inches deep 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 can encourage disease in other regions but is less of a concern with our low humidity.

Signs of underwatering include wilting leaves and slow growth. Overwatering can lead to yellowing leaves and root rot. A good layer of mulch, like straw or wood chips, will help retain moisture and regulate soil temperature.

Anaheim pepper plants can get quite tall and produce a lot of long, heavy fruits, so providing support is a good idea, although not always essential. Staking is the simplest and most effective method.

Install stakes at planting time, placing them a few inches away from the plant's base. As the plant grows, gently tie the main stem to the stake with soft twine or plant ties. This will prevent the branches from breaking under the weight of the peppers, especially during our occasional summer thunderstorms.

Pruning Anaheim peppers is fairly straightforward. The main thing to remember is to pinch off the early flowers. This encourages the plant to focus on vegetative growth, resulting in a stronger, more productive plant later in the season.

Throughout the season, you can also remove any yellowing or damaged leaves. As we approach the first frost in early October, you can remove any new flowers that won't have time to mature into peppers. This directs the plant's energy into ripening the existing fruit.

You can expect your first Anaheim pepper harvest late July through mid-September, about 75 days after transplanting. The peppers are ready to harvest when they are 6-8 inches long and green. At this stage, they have a mild flavor. If you prefer a bit more heat, wait until they turn red.

To harvest, use pruning shears or a sharp knife to cut the pepper from the plant, leaving about an inch of stem attached. Be careful not to damage the plant when harvesting. Anaheim peppers are continuous producers, so the more you harvest, the more peppers the plant will produce.

As the first frost approaches, harvest any remaining peppers, even if they are still green. They will ripen indoors if stored in a warm, bright location.

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

Blossom End Rot

• What it looks like: A sunken, dark brown or black leathery patch on the bottom (blossom end) of the fruit. It often affects the first fruits of the season.
• What causes it: A calcium deficiency caused by inconsistent watering. It's not a disease, but a nutrient uptake problem triggered by our region's drought/flood cycles.
• How to fix/prevent it: Water consistently! Mulch heavily to maintain even soil moisture. Avoid over-fertilizing with nitrogen. Remove any affected fruit.

Sunscald

• What it looks like: White, papery patches on fruit exposed to direct sun. The affected areas may blister and become susceptible to rot.
• What causes it: Intense, direct sunlight on fruit, especially after leaves are removed or lost, suddenly exposing previously shaded fruit to our intense UV.
• How to fix/prevent it: Don't over-prune foliage. Use shade cloth during periods of extreme heat. If fruit is already exposed, drape a small piece of row cover over it.

Aphids

• What it looks like: Clusters of tiny soft-bodied insects (green, black, or white) on stems and leaf undersides. You might also notice a sticky honeydew residue and curled or distorted new growth.
• What causes it: These rapid-reproducing, sap-sucking insects thrive in warm weather. Ant colonies may "farm" them for honeydew.
• How to fix/prevent it: A strong spray of water will knock them off. Encourage ladybugs and lacewings (natural predators). Use insecticidal soap for heavy infestations.

Mountain West Specific Challenges: Our moderate-at-altitude heat and low humidity can actually be beneficial for Anaheim peppers, reducing the risk of fungal diseases. However, the intense sun can lead to sunscald if the plants aren't properly shaded. Consistent watering is key to preventing blossom end rot, especially with our dry rainfall patterns.

Companion planting can really help your Anaheim peppers thrive. Tomatoes and basil are great companions because they share similar growing requirements and can help deter pests. Carrots and onions are also beneficial, as they can help repel soil-borne pests that might attack pepper roots.

Avoid planting fennel or brassicas (like cabbage, broccoli, and cauliflower) near your Anaheim peppers. Fennel can inhibit the growth of many plants, and brassicas can attract pests that also attack peppers.