Green Zebra Tomato in Zone 7B — Desert Southwest

Green Zebra Tomatoes are a fun addition to any Desert Southwest garden. Their tangy, slightly acidic flavor adds a unique twist to salsas and salads, and their striking green-striped skin makes them a real conversation starter. Plus, successfully harvesting tomatoes in our challenging climate is just plain satisfying.

Sure, the extreme heat and dry air present challenges, but with careful planning and attention to watering, you can absolutely enjoy a bountiful harvest. Our long, 245-day growing season gives you two opportunities to get these beauties in the ground.

Starting Green Zebra Tomato seeds indoors is the way to go in our region. This gives them a head start before the extreme heat arrives. Start your seeds indoors from early February through early March, about six weeks before you plan to transplant them outside.

Use seed trays or small pots filled with a good seed-starting mix. Keep the soil consistently moist, using bottom watering to avoid damping off. Place the trays in a warm location, ideally with a heat mat, and provide plenty of light with grow lights. With our very-early spring, these seedlings will be ready to go out before you know it.

Transplant your Green Zebra Tomato seedlings outdoors from late March through late April, after the danger of frost has passed. Before transplanting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

Space the plants 24-36 inches apart in well-draining soil. Even in late March, our sun can be intense, so consider using shade cloth for the first week or two after transplanting to prevent sunscald.

Consistent watering is absolutely crucial for Green Zebra Tomatoes in our arid climate. These plants need a lot of water, and inconsistent moisture can lead to problems like blossom end rot. The key is to find the right balance, especially during our monsoon season.

During the hot, dry spring and early summer, water deeply and regularly, aiming for about 2 inches of water per week. Use the "finger test" – if the soil is dry to a depth of 2 inches, it's time to water. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases. Once the monsoon moisture arrives, be careful not to overwater.

Signs of underwatering include wilting leaves and dry soil, while overwatering can lead to yellowing leaves and root rot. Adding a layer of mulch around the base of the plants helps retain moisture and regulate soil temperature, which is a must in our climate.

Green Zebra Tomatoes are an indeterminate variety, meaning they'll keep growing and producing fruit all season long. They definitely need support to stay off the ground and prevent breakage. Standard tomato cages or sturdy stakes work well.

Install the support at planting time to avoid disturbing the roots later. As the plants grow, gently tie the stems to the stakes or guide them through the cage to keep them upright. This prevents the fruit from touching the soil and reduces the risk of disease.

Pruning Green Zebra Tomatoes helps improve air circulation and encourages fruit production. Focus on removing suckers, which are the small shoots that grow in the junction between the main stem and the branches. Removing these suckers directs the plant's energy towards fruit development.

Prune regularly throughout the growing season, especially after the monsoon hits. As the first frost approaches in mid- November, you can prune off the top of the plant to encourage the remaining green tomatoes to ripen.

You can expect your first harvest of Green Zebra Tomatoes from mid June through late July, about 75 days after transplanting. One of the trickiest things about this variety is knowing when they're ripe, since they stay green. Look for a slight softness to the touch and an amber undertone to the green skin. The stripes will also become more pronounced.

Gently twist or cut the tomatoes from the vine, being careful not to damage the plant. Regular harvesting encourages continued production. As mid- November approaches and the threat of frost looms, harvest any remaining mature green tomatoes and bring them indoors to ripen. They'll ripen best in a single layer, not touching, in a cool, dark place.

Here are three common problems you might encounter with Green Zebra Tomatoes in the Desert Southwest:

Blossom End Rot

• What it looks like: A sunken, dark brown or black leathery patch on the bottom of the tomato.
• What causes it: Calcium deficiency due to inconsistent watering, a common problem in our climate's drought/flood cycles.
• How to fix/prevent it: Water consistently, especially during dry spells. Mulch heavily to maintain even soil moisture. Avoid over-fertilizing with nitrogen, and remove any affected fruit.

Knowing When Ripe

• What it looks like: Green tomatoes that may or may not be ripe.
• What causes it: Green Zebra Tomatoes stay green when ripe, making it hard to tell.
• How to fix/prevent it: Look for a slight softness to the touch, an amber undertone to the green skin, and more pronounced stripes. Experience is the best teacher!

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 (Alternaria solani) that thrives in warm, humid conditions, often spread by soil splash.
• 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.

Desert Southwest Specific Challenges: The extreme heat can stress the plants, making them more susceptible to problems. Our arid climate, punctuated by monsoon downpours, creates cycles of drought and flood that can lead to blossom end rot. The alkaline soil can also affect nutrient uptake.

Companion planting can help your Green Zebra Tomatoes thrive. Basil is a great companion because it repels pests and improves the flavor of the tomatoes. Carrots loosen the soil and can deter nematodes. Parsley attracts beneficial insects, and French marigolds repel nematodes and other pests.

Avoid planting brassicas (like cabbage and broccoli) near tomatoes, as they can stunt their growth. Fennel inhibits the growth of many plants, including tomatoes. Corn can attract tomato hornworms, so it's best to keep them separated.