Sun Gold Tomato in Zone 9A — Desert Southwest

Sun Gold tomatoes are practically candy, and you'll find yourself popping them straight from the vine. Their intense sweetness and manageable size make them perfect for salads, snacking, or even grilling—a true taste of summer in our Desert Southwest gardens. Plus, these beauties are prolific, giving you a rewarding harvest throughout our long growing season.

Sure, desert gardening comes with its own set of challenges, like extreme heat and alkaline soil. But with careful timing and a few smart strategies, you can successfully grow Sun Golds and enjoy their delicious flavor. Our 298-day growing season gives you the advantage of spring and fall crops.

Starting Sun Gold tomato seeds indoors is the way to go here in the Desert Southwest. Aim to start your seeds indoors from mid January through early February, which is about six weeks before you'll be transplanting them outside. This gets you a head start before our extreme heat arrives.

Use seed trays or small pots filled with a good seed-starting mix. Keep them warm (around 70-75°F) and provide plenty of light – a grow light works wonders. Don't let the soil dry out; bottom watering is your friend here. Spring comes early in our region, so starting indoors is key to a successful harvest.

Transplant your Sun Gold tomato seedlings outdoors in early to late March, after the last threat of frost has passed. Before you do, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Space your plants 24-36 inches apart to give them plenty of room to grow. Keep an eye on the weather during this time; even in March, we can get unexpected temperature swings. Protect young plants from strong winds and intense sun with shade cloth if needed.

Sun Gold tomatoes are thirsty plants, especially in our arid Desert Southwest climate. Consistent moisture is essential for a good harvest and to prevent fruit cracking. You'll need to water deeply and regularly, especially during our hot, dry spring and early summer.

During the hottest part of the growing season, you might need to water every day or every other day. Use the "finger test"—stick your finger about 2 inches into the soil. If it feels dry, it's time to water. Aim for about 1-2 inches of water per week, delivered at the base of the plant to avoid wetting the foliage and inviting disease. As the monsoon season arrives, adjust your watering schedule to account for the increased rainfall.

Underwatering can lead to stressed plants and cracked fruit. Overwatering can cause root rot, so be sure your soil drains well. Mulching around the base of the plant with organic material like straw or wood chips helps retain moisture and regulate soil temperature.

Sun Gold tomatoes are vigorous, indeterminate growers that need strong support to keep them off the ground. These plants WILL take over if you don't provide support. Cages or sturdy stakes work best for Sun Golds.

Install your support system at planting time to avoid damaging the roots later. As the plant grows, gently train the vines to climb the support. Use soft ties or clips to secure the stems.

Pruning is crucial for managing the vigorous growth of Sun Gold tomatoes in our region. If you don't prune, you'll end up with a tangled mess of vines and fewer tomatoes. Focus on removing suckers, which are the small shoots that grow in the "V" between the main stem and branches.

Prune regularly throughout the growing season, starting when the plant is about a foot tall. Remove the suckers while they're small to avoid stressing the plant. As the season winds down and the first frost approaches in early December, you can top the plant to encourage the remaining tomatoes to ripen.

Expect your first Sun Gold tomato harvest from late April through mid June, about 57 days after transplanting. The tomatoes are ready to pick when they turn a bright orange-gold color and are slightly soft to the touch. Ripe tomatoes will practically fall off the vine when you gently tug them.

Harvest regularly to encourage continued production. The more you pick, the more the plant will produce. As the first frost approaches in early December, harvest any remaining green tomatoes and bring them indoors to ripen. They may not be as sweet as vine-ripened tomatoes, but they'll still be delicious.

Here are a few common issues you might encounter with Sun Gold tomatoes in our Desert Southwest gardens:

Cracking

• What it looks like: Splits in the tomato skin, either circles around the stem or lines radiating from it.
• What causes it: Inconsistent watering, especially heavy watering after a dry spell. The fruit absorbs water too quickly for the skin to expand.
• How to fix/prevent it: Water consistently and deeply. Mulch around the base of the plant to maintain even soil moisture. Harvest ripe tomatoes promptly.

Over-production

• What it looks like: A massive amount of tomatoes all at once!
• What causes it: Sun Golds are vigorous and can produce more than you can use.
• How to fix/prevent it: Harvest frequently. Share with neighbors. Preserve excess tomatoes by canning, freezing, or making sauce.

Early Blight

• What it looks like: Brown spots with concentric rings (target or bullseye pattern) on lower leaves, spreading upward. Leaves yellow and drop.
• What causes it: A fungal disease that thrives in warm, humid conditions. Spreads via soil splash.
• How to fix/prevent it: Remove and destroy affected leaves. Mulch to prevent soil splash. Water at the base of the plant. Improve air circulation by pruning. Copper fungicide can slow the spread. Rotate crops yearly.

Desert Southwest Specific Challenges: Our extreme heat can stress tomato plants, making them more susceptible to problems. Sunscald can also be an issue, especially on exposed fruit, so providing some afternoon shade with shade cloth can be beneficial. And remember, our monsoon season can bring periods of high humidity, which can exacerbate fungal diseases like early blight.

Companion planting can help your Sun Gold tomatoes thrive in the Desert Southwest. Basil is a great companion because it repels tomato hornworms and other pests. Carrots improve the soil and deter nematodes. Parsley attracts beneficial insects that prey on tomato pests. French marigolds also repel nematodes and other soil pests.

Avoid planting brassicas (like cabbage and broccoli) near tomatoes, as they can stunt tomato growth. Fennel inhibits the growth of many plants, including tomatoes. Corn can attract tomato pests and diseases. Planting the right companions can create a healthier and more productive garden.