Bell Peppers in Zone 7B — Desert Southwest

Bell Peppers are a rewarding addition to any Desert Southwest garden. Their crisp texture and mild sweetness make them incredibly versatile in the kitchen, and there's nothing quite like the satisfaction of harvesting your own sun-ripened peppers from your backyard, especially after a long, hot summer. Plus, peppers thrive in our two distinct growing seasons.

Our extreme heat and intense sun can be challenging, but with careful timing and a few key strategies, you can successfully grow Bell Peppers here. Taking advantage of our long 245-day growing season gives you a great head start.

Starting Bell Pepper seeds indoors is the best way to get a jump on our very-early spring. You'll want to sow your seeds indoors from late January through mid February, roughly 8 weeks before you plan to transplant them outside. This head start is vital because of our short, intense growing windows.

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 and encourage strong root development. Place the trays in a warm location with plenty of light – a sunny windowsill or under grow lights works well.

Transplanting your Bell Peppers outdoors should happen from late March through late April, after the danger of the last frost has passed. Before transplanting, be sure to harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the intense Desert Southwest sun and fluctuating temperatures.

Space your plants 18-24 inches apart in well-draining soil. Even in late March and April, our daytime temperatures can jump up unexpectedly, so keep an eye on the forecast and provide temporary shade if needed during the initial transplant period.

Bell Peppers need consistent moisture, especially in our arid climate. Inconsistent watering leads to blossom end rot and thin-walled fruit, so a regular watering schedule is crucial. The goal is to keep the soil consistently moist, not soggy.

During the spring and fall growing seasons, aim to water deeply about 2-3 times per week, providing about 1-2 inches of water each time. During the hottest part of the summer, you may need to water every day or every other day, depending on your soil type and microclimate. Use the finger test – if the top 2 inches of soil feel dry, it's time to water. Water at the base of the plant to avoid wetting the foliage, which can lead to fungal issues in our desert environment, especially during the monsoon season.

Signs of underwatering include wilting leaves and blossom drop. Overwatering can cause yellowing leaves and root rot. A good layer of organic mulch, like straw or wood chips, can help retain moisture and regulate soil temperature.

While Bell Peppers have a bush-like growth habit, the weight of the fruit can sometimes cause branches to bend or break, especially after a monsoon rain. A simple stake or tomato cage provides adequate support.

Install the support at planting time to avoid disturbing the roots later. Gently tie the main stem to the stake with soft twine as the plant grows. This prevents the plant from toppling over, especially when it's loaded with peppers.

Pinching off the first few flowers that appear on your Bell Pepper plants encourages the plant to focus its energy on vegetative growth, resulting in a stronger, more productive plant. Remove any fruit that touches the ground to prevent rot and pest issues.

Throughout the growing season, prune out any interior branches that are overcrowded or yellowing to improve airflow and reduce the risk of disease. As the first frost approaches around mid- November, you can remove any remaining small flowers to encourage the plant to put its energy into ripening existing fruit.

You can expect your first harvest of Bell Peppers from early June through late July, about 70 days after transplanting. Green peppers can be harvested at any size, but they develop their full sweetness and flavor when they turn red, yellow, or orange.

A ripe pepper will be firm, glossy, and easily detached from the plant with a gentle twist or snip of the stem. Regular harvesting encourages continued production. As the first frost approaches in mid- November, harvest any remaining peppers, even if they are still green. Green peppers will ripen indoors if stored in a cool, dark place.

Bell Peppers can face a few challenges in the Desert Southwest, but understanding these problems helps you prevent or manage them effectively.

• Blossom End Rot
• What it looks like: Sunken, dark brown or black leathery patch on the bottom of the pepper.
• What causes it: Calcium deficiency due to inconsistent watering, common in our arid climate with monsoon cycles.
• How to fix/prevent it: Water consistently, especially during fruit development. Mulch heavily to maintain even soil moisture. 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 from extreme heat, low humidity, and poor pollination – all factors in our Desert Southwest summers.
• How to fix/prevent it: Be patient; fruit set resumes when temperatures moderate. Provide afternoon shade with shade cloth during extreme heat. Keep plants well-watered. Try hand-pollination.
• Aphids
• What it looks like: Clusters of tiny green, black, or white insects on stems and leaf undersides. Sticky honeydew residue.
• What causes it: Rapid reproduction in warm weather, common in our long growing season.
• How to fix/prevent it: Strong water spray knocks them off. Encourage beneficial insects. Insecticidal soap or neem oil for heavy infestations.
• Sunscald
• What it looks like: White, papery patches on fruit exposed to direct sun.
• What causes it: Intense, direct sunlight on fruit, especially after pruning or leaf loss, very common in our intense Desert Southwest sun.
• How to fix/prevent it: Don't over-prune foliage. Use shade cloth in extreme heat. Maintain healthy foliage to shade fruit naturally.

Desert Southwest Specific Challenges: The extreme heat and intense sun of the Desert Southwest can exacerbate blossom drop and sunscald. Our arid climate requires diligent watering to prevent blossom end rot. The monsoon season can bring humidity spikes that increase the risk of fungal diseases if you're not careful about watering practices.

Companion planting can help your Bell Peppers thrive in the Desert Southwest. Tomatoes make good companions because they enjoy similar growing conditions and can provide some shade. Basil repels pests like aphids and whiteflies, while also attracting beneficial insects. Carrots and onions deter soil-borne pests and don't compete for the same nutrients. Spinach, planted early in the season, can act as a ground cover to help retain moisture and suppress weeds.

Avoid planting Bell Peppers near fennel, kohlrabi, or other brassicas (like cabbage and broccoli). Fennel inhibits the growth of many plants, while kohlrabi and brassicas can attract pests that also affect peppers.