Early Girl Tomato in Zone 7A — Desert Southwest

Early Girl Tomato is a fantastic choice for Desert Southwest gardeners looking for that first taste of homegrown goodness. It delivers reliably tasty, medium-sized tomatoes early in the season, perfect for salads, sandwiches, and snacking straight from the vine. Plus, getting that first harvest before the intense summer heat really kicks in is incredibly satisfying.

Our extreme heat and arid conditions here in Zone 7A present challenges, but Early Girl's early maturity means you can often harvest a good crop before the worst of the summer sun. With a 230-day growing season, you have plenty of time to get these tomatoes going strong.

Starting Early Girl Tomato seeds indoors is the way to go in our Desert Southwest climate. Begin in mid February through mid March, about six weeks before you plan to transplant them outside. This gets you a head start on the season and avoids the risk of late frosts.

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 forget to water from the bottom to encourage strong root growth and prevent damping off. It's a very-early spring start, so pay attention to overnight temperatures.

Transplant your Early Girl Tomato seedlings outdoors from early April through mid May, once the danger of frost has passed. Before planting, harden them off by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sunlight and temperature changes.

Space the plants 24-36 inches apart to give them room to grow. Even though we're past the typical frost dates, keep an eye on the forecast – a late cold snap can still happen. Protect your young plants if needed.

Watering is critical for Early Girl Tomatoes in our hot, arid Desert Southwest climate. Consistent moisture is key for steady production and preventing problems like blossom end rot. While Early Girl is more forgiving than some varieties, don't let it dry out!

During the spring, when temperatures are milder, water deeply about 2-3 times per week, providing about 1-2 inches of water each time. Once the extreme heat of summer arrives, increase watering to every day or every other day, ensuring they get 2-3 inches per week. With monsoon moisture in late summer, pay attention to rainfall and adjust accordingly. 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 leaves, as this can encourage fungal diseases in our arid climate. Signs of underwatering include wilting leaves and dry soil. Overwatering can lead to yellowing leaves and root rot. Mulch around your plants to help retain moisture and keep the soil cool.

Early Girl Tomato is an indeterminate variety, meaning it will continue to grow and produce fruit throughout the season. Providing adequate support is essential to keep the plant healthy and manageable. Standard 5-foot cages or sturdy stakes work well.

Install the support at planting time to avoid disturbing the roots later. As the plant grows, gently guide the stems through the cage or tie them to the stake. This will prevent the plant from sprawling on the ground and keep the fruit off the soil, reducing the risk of pests and diseases.

Pruning Early Girl Tomato can help improve air circulation and encourage earlier ripening, which is especially important in our Desert Southwest climate. Focus on removing the suckers that grow in the "V" between the main stem and branches.

Prune the lower suckers early in the season to direct the plant's energy towards fruit production. As the season progresses, you can continue to remove suckers as needed. As the first frost approaches around early November, consider topping the plant to encourage the remaining green tomatoes to ripen.

You can expect your first harvest of Early Girl Tomatoes from late May through late July, about 50 days after transplanting. The tomatoes are ready to pick when they turn a deep red color and are slightly soft to the touch.

Gently twist or cut the fruit from the vine, being careful not to damage the plant. To encourage continued production, harvest the tomatoes as soon as they are ripe. As the first frost approaches, harvest any remaining green tomatoes and bring them indoors to ripen. They'll ripen best in a single layer, not touching each other.

Here are some common problems you might encounter with Early Girl Tomato in the Desert Southwest:

Blossom End Rot

• What it looks like: Sunken, dark brown or black leathery patch on the bottom of the fruit, often affecting the first fruits of the season.
• What causes it: Calcium deficiency caused by inconsistent watering. The drought/flood cycles common in our monsoon climate disrupt calcium uptake.
• How to fix/prevent it: Water consistently! Mulch heavily to maintain even soil moisture. Avoid over-fertilizing with nitrogen. Remove affected fruit.

Early Blight

• What it looks like: Brown spots with concentric rings (target pattern) on lower leaves first, spreading upward. Leaves yellow and drop.
• What causes it: Fungal disease (Alternaria solani) that thrives in warm, humid conditions. Spreads via soil splash, which can be exacerbated by monsoon rains.
• How to fix/prevent it: Remove and destroy affected leaves. Mulch to prevent soil splash. Water at the base, not overhead. Improve air circulation through spacing and pruning. Copper fungicide can slow the spread. Rotate crops yearly.

Hornworms

• What it looks like: Large sections of leaves stripped overnight. Large (up to 4 inches) green caterpillars with white diagonal stripes. Dark droppings on leaves below.
• What causes it: Larvae of hawk moths. Eggs laid on tomato family plants. Caterpillars feed voraciously and can defoliate plants quickly.
• How to fix/prevent it: Handpick (they don't bite). Bt (Bacillus thuringiensis) spray is effective and organic. If you see white cocoons on a hornworm, leave it — those are parasitic wasp eggs that will kill it and produce more beneficial wasps.

Cracking

• What it looks like: Splits in tomato skin — either concentric (circles around stem) or radial (lines radiating from stem). Can expose flesh to rot.
• What causes it: Heavy watering or rain after a dry spell. Fruit absorbs water faster than skin can expand. Common after monsoon rains.
• How to fix/prevent it: Water consistently to avoid the dry/wet cycle. Mulch to maintain even moisture. Harvest promptly when ripe.

Desert Southwest Specific Challenges: Our extreme heat can cause sunscald, so consider using shade cloth during the hottest part of the day. Alkaline soil can affect nutrient uptake, so amend your soil with compost and consider using a fertilizer formulated for tomatoes. The arid humidity can reduce disease pressure, but be vigilant during monsoon season.

Companion planting can benefit your Early Girl Tomatoes in the Desert Southwest. Basil is a great companion because it repels tomato hornworms and whiteflies. Carrots improve soil drainage and deter nematodes. Parsley attracts beneficial insects that prey on tomato pests. French marigolds deter 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 like the corn earworm, which can also damage tomatoes.