Sun Gold Tomato in Zone 5B — Northeast

Sun Gold tomatoes are practically sunshine in fruit form, and they're a must-grow here in the Northeast. Their intensely sweet flavor is unmatched, and they're fantastic eaten straight off the vine, in salads, or even roasted. Plus, with our cool nights enhancing their sweetness, you’ll get a flavor that’s hard to beat.

Our short growing season and the risk of late spring or early fall frosts can be a challenge, but with a little planning, you can easily get a bountiful harvest from Sun Golds. With a 168-day growing season, starting seeds indoors and choosing early varieties gives you a head start to make the most of summer.

Starting Sun Gold tomato seeds indoors is the key to getting a jump on our short growing season. Aim to sow your seeds from late March through mid April – about six weeks before you plan to transplant them outside. This gives them a strong start before the risk of frost has passed.

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, either from a sunny windowsill or a grow light. Bottom watering helps keep the soil evenly moist without damping off issues.

Remember, spring in the Northeast often teases us with warm spells, so don't rush to plant them out too early. Patience is key!

Transplanting Sun Gold tomatoes outdoors should happen from early May through early June, once the danger of frost has passed. Before planting, harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun and wind.

When transplanting, space the plants 24-36 inches apart. Our weather can still be unpredictable at this time, so keep an eye on the forecast and be ready to cover them if a late frost threatens.

Sun Golds are thirsty plants, and consistent watering is crucial, especially with our moderate-to-humid Northeast summers. Aim to keep the soil consistently moist, but not waterlogged. The goal is to prevent those dreaded fruit cracks.

During the cooler spring, you might only need to water once or twice a week. As summer heats up, increase that to every other day, or even daily during hot, dry spells. Do the finger test: stick your finger about two inches into the soil. If it feels dry, it's time to water. As a general rule, provide about 1-2 inches of water per week, either from rain or irrigation.

Water at the base of the plant to avoid wetting the foliage, which can encourage fungal diseases in our humid conditions. Signs of underwatering include wilting leaves and blossom end rot, while overwatering can lead to yellowing leaves and root rot. A layer of mulch around the base of the plants helps retain moisture and keeps the soil temperature even.

Sun Gold tomatoes are vigorous, indeterminate plants that need strong support. They'll sprawl all over your garden if you don't give them something to climb on!

Tall, sturdy cages or strong stakes work best. Install the support at planting time to avoid disturbing the roots later. As the plant grows, gently weave the stems through the cage or tie them to the stake with soft twine.

Pruning is essential for managing Sun Golds in our Northeast gardens. Without it, they'll become a tangled mess and take over everything!

Focus on removing the suckers that grow in the "armpit" between the main stem and the branches. These suckers will just create more foliage and fewer tomatoes. Also, prune away the lower leaves that touch the soil to improve air circulation and reduce the risk of disease. As the season winds down in late summer (remember, first frost around early October), you can top the plant to encourage the remaining tomatoes to ripen.

The first harvest of your Sun Golds should be from early July through late August. These little gems are ready when they turn a deep orange-gold color and feel slightly soft to the touch. The flavor will be intensely sweet at this point.

Gently twist or snip the tomatoes from the vine, being careful not to damage the plant. Once they start producing, Sun Golds will keep coming all season long. As the first frost approaches in early October, harvest any remaining green tomatoes and bring them indoors to ripen. They may not be quite as sweet as vine-ripened ones, but they'll still be delicious.

Here are three common problems you might encounter with Sun Gold tomatoes in the Northeast:

Cracking

• What it looks like: Splits in the tomato skin, either concentric circles around the stem or radial lines radiating from the stem.
• What causes it: Heavy watering or rain after a dry spell. The fruit absorbs water faster than the skin can expand.
• How to fix/prevent it: Water consistently to avoid the dry/wet cycle. Mulch to maintain even moisture. Harvest promptly when ripe.

Over-Production

• What it looks like: So many tomatoes that you don't know what to do with them. Plants become weighed down.
• What causes it: Sun Golds are just prolific producers, especially in our moderate summer temperatures.
• How to fix/prevent it: Harvest frequently, share with neighbors, and get creative with recipes. Consider succession planting to stagger the harvest.

Early Blight

• What it looks like: Brown spots with concentric rings (target or bullseye 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 onto lower leaves.
• How to fix/prevent it: Remove and destroy affected leaves (don't compost). Mulch to prevent soil splash. Water at the base, not overhead. Improve air circulation through spacing and pruning. Copper fungicide slows spread. Rotate crops yearly.

Northeast Specific Challenges: Our moderate heat and moderate-to-humid humidity, combined with even rainfall, create ideal conditions for fungal diseases like early blight. Consistent watering is key to preventing cracking, but be mindful of overwatering, especially during rainy periods.

Companion planting can help your Sun Gold tomatoes thrive.

Good companions include:

• Basil: Repels tomato hornworms and improves tomato flavor.
• Carrots: Loosen the soil and don't compete for nutrients.
• Parsley: Attracts beneficial insects.
• French Marigolds: Repel nematodes and other pests.

Avoid planting near:

• Brassicas (cabbage, broccoli, cauliflower): Can stunt tomato growth.
• Fennel: Inhibits the growth of many plants.
• Corn: Attracts the same pests.