Bell Peppers in Zone 9A — Desert Southwest

Bell Peppers are a rewarding crop for the Desert Southwest gardener. The sweet, crisp flavor is so much better than store-bought, and they're incredibly versatile in Southwestern cuisine. Plus, there's real satisfaction in harvesting colorful peppers you grew yourself right here in our challenging climate.

Our extreme heat and intense sun can be tough on peppers, but with careful timing, you can harvest a great crop. Our long 298-day growing season gives you two chances – spring and fall – to get it right. You'll be harvesting before the worst of the summer heat hits.

Starting Bell Pepper seeds indoors is the way to go in our region. Get those seeds going from late December through mid January – about eight weeks before you plan to set them outside. This early start takes advantage of our very-early spring.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm – around 75-80°F – and provide plenty of light with grow lights. Don't forget to water from the bottom to encourage strong root growth without damping off.

Transplant your pepper seedlings outdoors from early to late March, once the danger of frost has passed. Be sure to harden them off first by gradually exposing them to outdoor conditions for about a week. This prevents transplant shock.

Space plants 18-24 inches apart in well-draining soil. Keep an eye on the weather forecast – those late cold snaps we sometimes get can still nip young plants.

Bell Peppers need consistent moisture, especially in our arid climate. Erratic watering leads to problems like blossom end rot. The key is to water deeply and regularly, but avoid soggy soil.

During the spring growing season, aim for about 1-2 inches of water per week, depending on rainfall. Stick your finger about two 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 and creating conditions for disease. Once the monsoons start, adjust your watering schedule accordingly.

Signs of underwatering include wilting leaves and blossom drop. Overwatering leads to yellowing leaves and root rot. Mulching around your pepper plants with organic matter helps retain moisture and regulate soil temperature.

Bell Peppers can get pretty heavy with fruit, and the branches are prone to breaking, so providing support is a good idea. A simple stake and some soft twine work perfectly.

Install the stake near the plant at transplant time to avoid disturbing the roots later. As the plant grows, gently tie the main stem to the stake. This prevents the plant from toppling over, especially when loaded with peppers.

Pinching off the first few flowers that appear encourages the plant to focus its energy on vegetative growth, leading to a stronger plant and bigger yields later. Remove any peppers that touch the ground to prevent rot.

Also, prune out some of the interior branches to improve airflow and reduce the risk of fungal diseases. As the season winds down in late fall, you can remove any remaining small fruit before the first frost. This directs the plant's energy back to the roots.

You can expect your first harvest from early May through late June, about 70 days after transplanting. Bell Peppers can be harvested green at the immature stage, but they're sweetest when fully ripe and colored red, yellow, or orange.

Gently twist or cut the pepper from the plant, being careful not to damage the branches. Regular harvesting encourages continuous production. As the first frost approaches in early December, harvest any remaining peppers, even if they're green. They will ripen indoors if stored in a cool, dark place.

Bell Peppers can face a few challenges in the Desert Southwest. Here's how to tackle them:

Blossom End Rot

• What it looks like: Sunken, dark brown or black leathery patch on the bottom of the pepper.
• What causes it: Inconsistent watering leads to calcium deficiency. Our dry air and alkaline soil make calcium uptake tricky.
• How to fix/prevent it: Water consistently, especially during fruit development. Mulch heavily. 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, especially when nights stay above 75°F. Low humidity can also contribute.
• How to fix/prevent it: Provide afternoon shade during the hottest part of the day. Keep plants well-watered.

Aphids

• What it looks like: Clusters of tiny insects on stems and leaf undersides. Sticky residue and distorted growth.
• What causes it: Rapid reproduction in warm weather. They love our long growing season.
• How to fix/prevent it: Strong water spray. Introduce 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, especially after pruning or leaf loss.
• How to fix/prevent it: Don't over-prune. Use shade cloth during extreme heat.

Desert Southwest Specific Challenges: Our extreme heat and low humidity can stress pepper plants, making them more susceptible to blossom drop and sunscald. Monsoon moisture can also lead to fungal diseases if airflow is poor. Consistent watering is crucial to combat blossom end rot in our alkaline soil.

Good companions for Bell Peppers include tomatoes, as they enjoy similar growing conditions. Basil repels pests and improves pepper flavor. Carrots and onions deter soil-borne pests. Spinach provides ground cover and helps retain moisture.

Avoid planting Bell Peppers near fennel, which inhibits growth. Kohlrabi and other brassicas like cabbage and broccoli compete for nutrients and attract pests that can also affect peppers.