Sun Gold Tomato in Zone 8B — Northern California

Sun Gold tomatoes are practically candy, and they thrive in our Northern California climate. Their intensely sweet flavor makes them perfect for snacking straight from the vine, adding to salads, or even grilling. The long growing season we enjoy here means you'll be harvesting these golden gems for months.

While we face challenges like drought and fire season, starting your Sun Golds at the right time gives them a head start before the heat really kicks in. Our 269-day growing season allows you to enjoy a bountiful harvest even with water restrictions. Careful planning makes all the difference.

Starting Sun Gold tomato seeds indoors gives them a crucial head start, especially with our early springs. Begin in late January through mid February, about six weeks before you plan to transplant them outside. This allows the seedlings to develop a strong root system before facing the garden.

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. Place the trays in a warm spot, ideally with a heat mat, and provide plenty of light using grow lights.

Our typically mild spring temperatures mean that seedlings can grow quickly if given the right conditions indoors. Just be sure to monitor them closely.

Transplant your Sun Gold tomato seedlings outdoors in mid March through mid April, after the risk of frost has passed. Before transplanting, harden off the seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sunlight, wind, and temperature fluctuations.

Choose a sunny spot with well-drained soil, spacing plants 24-36 inches apart. Even in mid-March, we can still get some unexpected cool snaps, so be prepared to cover your young plants if temperatures dip.

Sun Gold tomatoes need consistent moisture, especially during our dry summers. Unlike some other regions, we don't have humidity on our side, so attentive watering is crucial. The key is to water deeply and regularly, aiming for about 1-2 inches of water per week, depending on rainfall.

Use the "finger test" to check the soil moisture 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 disease. Overhead watering in our low-humidity climate is not as risky, but still best to avoid.

Signs of underwatering include wilting leaves and blossom end rot. Overwatering can lead to yellowing leaves and root rot. Applying a thick layer of mulch around the base of the plants helps retain moisture and regulate soil temperature, which is especially helpful during our warmer months.

Sun Gold tomatoes are vigorous indeterminate growers, so they need strong support to keep them off the ground. Cages or sturdy stakes work best. These plants will sprawl and take over if you don't provide adequate support.

Install the support at planting time to avoid disturbing the roots later. As the plant grows, gently tie the main stem to the support to encourage upward growth. Choose the tallest and strongest support you can find.

Pruning is essential for managing Sun Gold tomatoes, as they tend to produce suckers that can quickly overwhelm the plant. Remove suckers (the small shoots that grow between the main stem and branches) regularly to encourage better airflow and fruit production.

Focus on pruning the lower leaves as they start to yellow or show signs of disease. As the end of the season approaches (late November in NorCal), you can top the plant to encourage the remaining green tomatoes to ripen before the first frost.

You can expect your first Sun Gold tomato harvest from mid May through late June, depending on when you transplanted. The tomatoes are ready to pick when they turn a vibrant orange-gold color and are slightly soft to the touch. They should have an intensely sweet aroma.

Gently twist or snip the tomatoes from the vine, being careful not to damage the plant. Regular harvesting encourages continued production. As the first frost approaches (late November in NorCal), harvest any remaining green tomatoes and bring them indoors to ripen. They'll ripen best in a single layer in a paper bag.

Here are three common problems you might encounter with Sun Gold tomatoes in Northern California:

Cracking

• What it looks like: Splits in tomato skin, either concentric (circles around stem) or radial (lines radiating from stem).
• What causes it: Inconsistent watering. Our dry summers followed by occasional heavy rain can cause the fruit to absorb water too quickly.
• How to fix/prevent it: Water consistently and deeply, especially during dry spells. Mulch around the plants to maintain even soil moisture. Harvest ripe tomatoes promptly.

Over-Production

• What it looks like: An overwhelming amount of tomatoes, leading to smaller fruit size and potential plant stress.
• What causes it: Sun Golds are prolific producers, and our long growing season encourages even more fruit.
• How to fix/prevent it: Regular pruning to manage growth. Harvest frequently to encourage the plant to keep producing. Share your bounty with neighbors.

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: Fungal disease (Alternaria solani) 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. Improve air circulation through spacing and pruning. Copper fungicide can slow the spread.

Northern California Specific Challenges: Our moderate-to-hot summers and low humidity mean that consistent watering is crucial to prevent cracking and blossom end rot. The dry-summer rainfall pattern requires vigilance in managing soil moisture and preventing fungal diseases.

Companion planting can help your Sun Gold tomatoes thrive. Basil is a great companion because it repels pests and improves tomato flavor. Carrots loosen the soil and attract beneficial insects. Parsley attracts pollinators. 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. Corn can attract pests that also affect tomatoes and can block sunlight if planted too close.