Celebrity Tomato in Zone 10A — Southern California

Celebrity Tomato is a fantastic choice for Southern California gardens. You'll get reliable yields of delicious, medium-sized tomatoes perfect for slicing, salads, and sauces. Plus, their excellent disease resistance makes them a winner even with our sometimes unpredictable weather.

Sure, we have our challenges with drought and those intense summer heat waves inland. But with our long 349-day growing season and mild winters, starting your Celebrity Tomatoes at the right time will set you up for a successful and satisfying harvest.

Starting your Celebrity Tomato seeds indoors gives you a head start on our very-early spring. Aim to sow your seeds from mid-December through early January, about six weeks before you plan to transplant them outside.

You'll need seed trays or small pots, a good seed-starting mix, and a warm, well-lit location. Bottom watering is key to prevent damping-off – simply set your seed trays in a shallow dish of water and let them soak it up from the bottom. A heat mat can help speed up germination, and once the seedlings emerge, provide plenty of light with a grow light or a sunny windowsill.

Transplant your Celebrity Tomato seedlings outdoors from late January through late February, once they have a few sets of true leaves and the weather has settled a bit. Before planting them directly in the garden, you'll want to harden them off. This means gradually exposing them to outdoor conditions for about a week.

Choose a sunny spot with well-drained soil, and space your plants 24-36 inches apart. Keep an eye on the forecast for any unexpected cold snaps that can sometimes occur at this time of year.

Consistent moisture is key to growing great Celebrity Tomatoes, especially here in Southern California. While we don't have the humidity of other regions, our summer heat inland can be intense. Water deeply and regularly, aiming for about 1-2 inches of water per week, depending on rainfall.

Use the "finger test" – stick your finger into the soil about 2 inches deep. If it feels dry, it's time to water. Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our low-to-moderate humidity. Overwatering can lead to yellowing leaves and root rot, while underwatering can cause blossom end rot.

Mulching around your plants with straw or wood chips helps retain moisture and suppress weeds, which is especially helpful during our dry season.

Celebrity Tomatoes are determinate, but they still benefit from support to keep the fruit off the ground and prevent sprawling. Because they're semi-determinate, meaning they don't grow as tall as indeterminate varieties, medium-height cages or sturdy stakes work well.

Install your chosen support system at planting time to avoid disturbing the roots later on. As the plant grows, gently guide the stems through the cage or tie them to the stake with soft twine.

You can expect your first Celebrity Tomato harvest from early April through late May, about 70 days after transplanting. The fruits are ready to pick when they are a deep red color, firm to the touch, and have a slight give when gently squeezed.

To harvest, simply twist or clip the tomato from the vine, being careful not to damage the plant. Regular harvesting encourages continued production throughout the season. Even as late December approaches, continue to harvest any ripening fruit; green tomatoes will ripen indoors if frost threatens.

Here are a few common problems you might encounter with Celebrity Tomatoes in Southern California:

Blossom Drop

• What it looks like: Flowers fall off the plant without setting fruit. Small fruit yellows and drops. The plant itself looks healthy, but produces little to no tomatoes.
• What causes it: Temperature stress is the main culprit. Our summer heat inland, especially when nighttime temperatures stay high, can prevent proper pollination. Low humidity, excess nitrogen, and poor pollination can also contribute.
• How to fix/prevent it: Be patient; fruit set usually resumes when temperatures moderate. Provide afternoon shade during extreme heat. Keep plants well-watered, but avoid over-fertilizing with nitrogen. Try hand-pollination by gently shaking the flower clusters.

Hornworms

• What it looks like: Large sections of leaves are stripped overnight. You'll find large (up to 4 inches), green caterpillars with white diagonal stripes. Also look for dark droppings on the leaves below.
• What causes it: These are the larvae of hawk moths. They lay their eggs on tomato family plants, and the caterpillars are voracious eaters.
• How to fix/prevent it: Handpicking is effective (they don't bite!). Bt (Bacillus thuringiensis) spray is a safe, organic option. If you see hornworms with white cocoons on them, leave them alone — those are parasitic wasp eggs that will kill the hornworm and release beneficial wasps into your garden.

Early Blight

• What it looks like: Brown spots with concentric rings (a target or bullseye pattern) appear on the lower leaves first, spreading upward. Leaves yellow and drop.
• What causes it: This is a fungal disease (Alternaria solani) that thrives in warm, humid conditions. It spreads via soil splash onto the lower leaves.
• How to fix/prevent it: Remove and destroy affected leaves (don't compost them!). Mulch around the plants to prevent soil splash. Water at the base of the plant, not overhead. Improve air circulation by spacing plants properly and pruning if needed. Copper fungicide can help slow the spread. Rotate crops yearly.

Southern California Specific Challenges: Our combination of summer heat inland and low-to-moderate humidity can stress tomato plants. Consistent watering is crucial, but be mindful of potential water restrictions. Mulching helps conserve moisture and regulate soil temperature. During Santa Ana winds, be sure to provide extra support and protection to prevent damage.

Companion planting can really boost your Celebrity Tomato's health and productivity. Basil is a classic companion because it repels tomato hornworms and whiteflies, plus it improves the flavor of the tomatoes. Carrots deter nematodes in the soil, while parsley attracts beneficial insects that prey on tomato pests. French marigolds are great for suppressing nematodes and other soil pests.

Avoid planting brassicas (like broccoli, cabbage, and kale) near tomatoes, as they can stunt their growth. Fennel inhibits the growth of many plants, including tomatoes, so keep it far away. Corn can attract tomato pests like the corn earworm, which can also damage tomato fruit.