Sun Gold Tomato in Zone 4B — Midwest

Sun Gold tomatoes are practically candy from the garden. Their intense sweetness and bright orange color make them a favorite for snacking, salads, and just about anything else you can imagine. Plus, they thrive in our Midwest summers, soaking up the sunshine and producing like crazy if you give them what they need.

We all know Midwest weather can be a mixed bag. But don't let that scare you off. By starting your seeds indoors and timing your transplant just right, you can easily get a huge harvest of these delicious tomatoes within our 138-day growing season.

Start your Sun Gold tomato seeds indoors from early to late April. This gives them about 6 weeks to get a head start before the weather warms up enough to move them outside after our last frost. Use seed starting trays with a good quality seed starting mix.

Keep the trays warm, around 70-75°F, and provide plenty of light. A heat mat underneath can really help with germination. I like to bottom water my seedlings by placing the tray in a shallow container of water, letting the soil soak it up from the bottom. This encourages strong root growth and prevents damping off. Remember, our spring can be moderate-to-late, so be patient and watch for late frost!

Transplant your Sun Gold tomato seedlings outdoors from late May through late June, after the danger of frost has passed. Before planting them in the ground, you'll want to harden them off. This means gradually exposing them to outdoor conditions over about a week.

Start with a few hours of shade each day, gradually increasing the amount of sun and wind they experience. Plant them 24-36 inches apart in a sunny spot with fertile soil. In the Midwest, we sometimes get unexpected cold snaps even in late May, so keep an eye on the forecast and be ready to cover your young plants if needed.

Sun Gold tomatoes are thirsty plants, especially when they're loaded with fruit. They need consistent moisture throughout the growing season to produce those sweet, juicy little gems. But with our wet-summer rainfall in the Midwest, it's a balancing act.

During the peak of summer, when we're getting those summer heat spells, aim to give your plants about 1-2 inches of water per week, either from rainfall or supplemental watering. Use the finger test to check the soil moisture – stick your finger about 2 inches deep. If it feels dry, it's time to water.

Water at the base of the plant to avoid getting the leaves wet, which can encourage fungal diseases in our moderate-to-humid climate. Overwatering can be just as bad as underwatering, leading to root rot. Signs of underwatering include wilting leaves and dry, cracked soil. Overwatering can cause yellowing leaves and mushy soil. A good 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, meaning they'll keep growing and producing all season long. They need strong support to keep them off the ground and prevent them from sprawling.

A tall tomato cage is a good option, especially if you're short on space. But for Sun Golds, I find that sturdy stakes work even better. Install the support at planting time to avoid damaging the roots later on. As the plant grows, tie the main stem to the stake with soft twine or fabric strips. These plants get BIG, so don't skimp on support.

If you don't prune your Sun Gold tomatoes, they'll quickly take over your garden. These plants are known for their aggressive growth habit. The key is to remove the suckers that grow in the "armpit" between the main stem and the branches.

Pinch them off when they're small, before they get too big and steal energy from the main plant. Focus on removing suckers from the bottom of the plant to improve air circulation and prevent disease. As we approach late September and the threat of first frost in the Midwest, you can top the plant to encourage the remaining tomatoes to ripen.

You can expect your first harvest of Sun Gold tomatoes from mid July through early September, depending on when you transplanted them. These little guys ripen quickly, so check them often. They're ready to pick when they turn a deep orange-gold color and are slightly soft to the touch. They should also practically fall off the vine when you gently tug them.

Harvesting regularly encourages the plant to keep producing. As the end of the season approaches and we get closer to that first frost in late September, you can harvest any remaining green tomatoes and bring them indoors to ripen. Place them in a paper bag with a banana or apple to speed up the ripening process.

Here are some common problems you might encounter with Sun Gold tomatoes in the Midwest:

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, you don't know what to do with them all!
• What causes it: Sun Golds are just prolific! Fertile soil and plenty of sunshine in the Midwest contribute to this.
• How to fix/prevent it: Give them away! Share with neighbors, friends, and family. Make sauce, salsa, or roasted tomatoes. Preserve them for winter. Succession plant less-prolific varieties.

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.

Midwest Specific Challenges: Our moderate-to-hot heat, moderate-to-humid humidity, and wet-summer rainfall can create the perfect conditions for fungal diseases like early blight. Consistent watering and good air circulation are key to keeping your Sun Gold tomatoes healthy and productive.

Companion planting can help your Sun Gold tomatoes thrive in the Midwest. Basil is a classic companion because it repels tomato hornworms and other pests, and it's delicious with tomatoes. Carrots improve soil drainage and aeration, which is especially helpful if you have clay soil. Parsley attracts beneficial insects that prey on tomato pests. French marigolds deter nematodes and other soil-borne pests.

Avoid planting brassicas (like cabbage and broccoli) near tomatoes, as they can stunt tomato growth. Fennel inhibits the growth of many plants, including tomatoes. Corn can block sunlight and compete for nutrients and water.