Sun Gold Tomato in Zone 6A — Pacific Northwest

Sun Gold tomatoes are like sunshine in cherry tomato form. Their intensely sweet flavor makes them irresistible straight from the vine, perfect for salads, or even a quick snack while you're weeding. In our Pacific Northwest gardens, the cool nights actually concentrate those sugars, making Sun Golds even more delicious.

Growing tomatoes in the PNW can be a bit of a gamble with our cool springs and the threat of late blight. But with Sun Golds' relatively short 57-day maturity and our long, mild fall, you can absolutely enjoy a bountiful harvest within our 148-day growing season.

Starting Sun Gold tomato seeds indoors is crucial to get a head start on our relatively short growing season here in the PNW. Aim to sow your seeds early to late April, about six weeks before the last expected frost. This gives the seedlings plenty of time to develop before transplanting outdoors.

Use seed starting trays or small pots filled with a good quality seed starting mix. Keep the soil consistently moist, and bottom watering is a great way to avoid damping off. Provide a warm environment (around 70-75°F) and plenty of light – a grow light is ideal, especially with our often overcast spring days.

Remember, our springs here in the PNW are slow to warm up, so be patient. Your seedlings will thank you for the extra TLC indoors.

Transplant your Sun Gold tomato seedlings outdoors from late May through late June, once the soil has warmed up and the risk of frost has passed. Before planting, it's essential to harden off your seedlings by gradually exposing them to outdoor conditions for about a week. This helps them adjust to the sun, wind, and temperature fluctuations.

Choose a sunny spot in your garden with well-drained soil. Space your plants 24-36 inches apart to allow for adequate air circulation and growth. Keep an eye on the weather forecast. We sometimes get unexpected cold snaps even in early summer, so be prepared to cover your young plants if necessary.

Sun Gold tomatoes are thirsty plants, and consistent watering is key to a successful harvest, especially with our dry summer months. However, overwatering is just as bad as underwatering, especially with the risk of late blight in our region.

During the spring, when rainfall is more frequent, check the soil moisture before watering. Stick your finger about 2 inches deep into the soil – if it feels dry, it's time to water. Aim for about 1-2 inches of water per week, depending on rainfall. As the weather warms up and the dry summer months arrive, you'll likely need to increase watering frequency.

Water at the base of the plant to avoid wetting the leaves, which can encourage fungal diseases. Signs of underwatering include wilting leaves and dry soil. Overwatering can lead to yellowing leaves and root rot. Mulching around the base of the plant helps retain moisture and regulate soil temperature, which is especially beneficial during our mild summers.

Sun Gold tomatoes are vigorous, indeterminate plants, meaning they'll keep growing and producing fruit all season long. They need strong support to keep them off the ground and prevent sprawling.

Tall tomato cages or sturdy stakes work best. Install the support at planting time to avoid disturbing the roots later on. As the plant grows, gently tie the main stem to the stake or train it to grow within the cage. These plants get HUGE, so don't skimp on the support!

Sun Gold tomatoes are notorious for their rampant growth, so regular pruning is essential to keep them manageable and productive. Focus on removing suckers, which are the small shoots that grow in the "armpit" between the main stem and branches.

Prune suckers early in the morning on a dry day to prevent disease. Throughout the growing season, continue to remove suckers as they appear. In late summer, as our first frost approaches around early October, you can also top the plant to encourage the remaining green tomatoes to ripen.

You can expect your first Sun Gold tomatoes to ripen from mid July through early September, depending on when you transplanted. These little gems are ready to pick when they turn a vibrant orange-gold color and are slightly soft to the touch. They should practically fall off the vine when they're perfectly ripe.

Gently twist the tomato from the vine to avoid damaging the plant. Harvest regularly to encourage continued production. As the end of the season approaches and the threat of frost looms, harvest any remaining green tomatoes and bring them indoors to ripen. They'll still develop a decent flavor, though not quite as sweet as vine-ripened ones.

Even with careful planning, you might encounter some common problems when growing Sun Gold tomatoes in the Pacific Northwest.

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: Inconsistent watering, especially 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 soil moisture. Harvest promptly when ripe.

Over-Production

• What it looks like: An overwhelming abundance of tomatoes that you can't possibly eat or give away fast enough.
• What causes it: Sun Golds are incredibly prolific! Our mild summers and cool nights create ideal conditions for fruit set.
• How to fix/prevent it: Embrace it! Find creative ways to use your tomatoes (sauce, salsa, drying). Share with neighbors and friends. Consider succession planting to spread out 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.

Pacific Northwest Specific Challenges: Here in the PNW, late blight is a major concern for tomatoes. While Sun Golds are relatively early maturing, making them less susceptible, it's still important to take preventative measures. Ensure good air circulation, avoid overhead watering, and monitor plants closely for any signs of disease. Slugs can also be a nuisance, especially for young plants, so use appropriate control methods like beer traps or copper tape.

Companion planting can help your Sun Gold tomatoes thrive in the Pacific Northwest. Basil is a classic companion because it repels pests like tomato hornworms and whiteflies, and it's said to improve the flavor of the tomatoes. Carrots and parsley attract beneficial insects that prey on tomato pests. French marigolds deter nematodes and other soil pests.

Avoid planting tomatoes near brassicas (cabbage, broccoli, cauliflower) as they can stunt tomato growth. Fennel inhibits the growth of many plants, including tomatoes. Corn can block sunlight and compete for nutrients. These combinations can be particularly detrimental in our region where we need to maximize sunlight and soil resources.