Sungold Tomatoes: How to Grow Sweet Cherry Tomatoes
Sungold tomatoes are widely regarded as one of the sweetest and most flavourful cherry tomato varieties available to home gardeners. Their vibrant orange fruits, intense sweetness, and heavy cropping habit have earned them a near-legendary reputation among tomato growers. Whether grown in a greenhouse, polytunnel, large container, or a warm, sheltered outdoor position, Sungold tomatoes reward careful growing with long trusses of irresistibly sweet fruit.
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This guide explains exactly how to grow Sungold tomatoes successfully, covering sowing, planting, watering, feeding, training, harvesting, and managing common problems. With the right care, Sungold plants can produce exceptional yields over a long season and quickly become a firm favourite in your garden.
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What Are Sungold Tomatoes?
Sungold is a cherry tomato variety that produces small, round, bright orange fruits with an exceptionally sweet, fruity flavour. It is a cordon (indeterminate) tomato, meaning the plant continues to grow, flower, and fruit throughout the season rather than stopping at a set height.
Plants are vigorous and fast-growing, often reaching over two metres tall under good conditions. The fruits are typically produced in long trusses and are best eaten fresh, straight from the plant, where their sweetness and aroma are at their peak.
Sungold tomatoes are particularly popular with children and those who prefer sweeter tomatoes for snacking, salads, and lunchboxes.
Why Sungold Tomatoes Are So Sweet
The exceptional sweetness of Sungold tomatoes comes from their high sugar content combined with balanced acidity. Unlike some cherry tomatoes that are sweet but lack depth, Sungold offers a rich, complex flavour that remains consistent throughout the season.
Good growing conditions enhance this sweetness. Plenty of sunlight, steady watering, and balanced feeding all contribute to better flavour. Stress from drought or inconsistent care can reduce sweetness and affect fruit quality.
Where to Grow Sungold Tomatoes
Sungold tomatoes perform best under cover in the UK, but they can also be grown outdoors in warm, sheltered locations.
Greenhouse or Polytunnel
Growing Sungold tomatoes under cover provides the most reliable results. Stable temperatures, protection from rain, and improved light levels encourage strong growth, better fruit set, and higher sugar levels.
Outdoors
In warm regions or during good summers, Sungold tomatoes can be grown outdoors. Choose the sunniest, most sheltered spot available, ideally against a south-facing wall or fence.
Containers
Sungold tomatoes grow extremely well in large containers. This makes them ideal for patios, balconies, and small gardens where space is limited.
When to Sow Sungold Tomato Seeds
Correct timing is essential for strong, productive plants.
In the UK, Sungold tomatoes are usually sown indoors from late February to late March. Earlier sowing is suitable if you have a heated propagator or grow lights. For outdoor growing, sowing in late March often produces sturdier plants that cope better with outdoor conditions.
Seeds germinate best at temperatures between 18–22°C, with seedlings typically appearing within 7–14 days.
Avoid sowing too early without sufficient light, as this can result in tall, weak seedlings that struggle to establish later.
How to Sow Sungold Tomato Seeds
Fill clean pots or seed trays with fine, moist seed compost. Sow seeds thinly on the surface and cover lightly with compost or vermiculite.
Water gently and place the pots in a warm position. Once seedlings emerge, move them into bright light immediately.
When seedlings develop their first true leaves, prick them out into individual pots. Handle seedlings by their leaves rather than the stems to avoid damage.
Growing Conditions for Sungold Tomatoes
Light
Sungold tomatoes need plenty of sunlight to produce sweet fruit. Aim for at least 6–8 hours of direct sunlight per day. In greenhouses, keep glass or plastic panels clean to maximise light levels.
Temperature
Ideal daytime temperatures are between 18–24°C. Growth slows below 10°C, and frost will kill plants. Protect plants from cold nights and sudden temperature drops.
Airflow
Good ventilation reduces disease risk and helps with pollination. Open greenhouse vents and doors regularly, especially during warm or humid weather.
Planting Sungold Tomatoes
When to Plant Out
Under cover, Sungold tomatoes can usually be planted out from late April to early May, once greenhouse temperatures are stable.
For outdoor planting, wait until all risk of frost has passed, usually late May to early June. Harden plants off gradually over 7–10 days before planting outside.
Spacing
Space plants around 45–60cm apart. Sungold plants are vigorous, and good spacing improves airflow and light penetration.
Planting Depth
Plant tomatoes deeply, burying the stem up to the first set of leaves. This encourages strong root development and more resilient plants.
Growing Sungold Tomatoes in Containers
Sungold tomatoes are well suited to container growing, but pot size is important.
Choose containers at least 30–35cm deep and wide. Use high-quality compost with good drainage. Position containers in the sunniest, most sheltered location available.
Container-grown plants dry out more quickly than those in the ground, so consistent watering is essential.
Supporting and Training Sungold Tomatoes
As a cordon variety, Sungold tomatoes need regular support and training.
Use strong canes, strings, or spiral supports to keep plants upright. Tie the main stem loosely and adjust ties as the plant grows.
Removing Side Shoots
Side shoots appear between the main stem and leaf joints. Remove these regularly to maintain a single-stem structure.
Pinching out side shoots when small prevents plants becoming bushy and directs energy into fruit production rather than excess foliage.
Because Sungold plants grow vigorously, side shoots can appear quickly and need frequent attention.
Watering Sungold Tomatoes
Consistent watering is one of the most important factors for producing sweet, high-quality fruit.
Water deeply and regularly, keeping the soil or compost evenly moist. Avoid allowing plants to dry out completely, followed by heavy watering, as this can cause fruit splitting and reduce sweetness.
Always water at the base of the plant and avoid wetting the foliage to reduce disease risk.
During hot weather, greenhouse and container-grown Sungold tomatoes may need watering daily.
Feeding Sungold Tomatoes
Sungold tomatoes are heavy feeders and need regular nutrition to sustain strong growth and heavy cropping.
Once flowers appear and the first fruits begin to form, start feeding with a high-potassium tomato feed. Feed weekly, increasing frequency slightly for container-grown plants if growth is strong.
Avoid overfeeding with nitrogen, which encourages leafy growth at the expense of flowers, fruit, and flavour.
Balanced feeding supports both yield and sweetness.
Flowering and Pollination
Sungold tomatoes are self-pollinating, but good conditions improve fruit set.
In greenhouses, gently tapping plants or supports on warm days helps release pollen. Good ventilation and stable temperatures also improve pollination success.
Extreme heat or cold can reduce fruit set, so maintaining steady conditions is important.
Managing Growth and Pruning
As Sungold plants grow tall and vigorous, managing foliage is important.
Remove lower leaves gradually once fruit trusses begin to ripen. This improves airflow, reduces disease risk, and allows more light to reach the fruits.
Avoid removing too many leaves at once, as this can stress the plant and reduce productivity.
Harvesting Sungold Tomatoes
Sungold tomatoes are ready to harvest when fully orange and slightly soft to the touch. Fully ripened fruits have the highest sugar levels and best flavour.
Harvest regularly to encourage continued cropping. Picking ripe fruits promptly helps the plant focus energy on producing new trusses.
Under good conditions, Sungold tomatoes can crop from early summer through to early autumn.
Common Problems with Sungold Tomatoes
Fruit Splitting
Usually caused by irregular watering. Maintain consistent moisture levels to prevent sudden swelling of fruits.
Poor Fruit Set
Often caused by low temperatures, poor ventilation, or excessive heat. Improve airflow and maintain stable growing conditions.
Yellowing Leaves
Some yellowing of lower leaves is normal. Widespread yellowing may indicate nutrient imbalance or watering issues.
Tomato Blight
Sungold tomatoes are not blight-resistant. Reduce risk by improving airflow, avoiding wet foliage, and removing affected leaves promptly.
Growing Sungold Tomatoes Outdoors in the UK
While Sungold tomatoes are best grown under cover, they can succeed outdoors in warm, sheltered positions.
Choose a sunny location with protection from wind and rain. Improve drainage and airflow to reduce disease risk.
In cooler or wetter summers, outdoor crops may be smaller and later than greenhouse-grown plants, but still produce excellent-tasting fruit.
Saving Seeds from Sungold Tomatoes
Sungold tomatoes are a hybrid variety. Seeds saved from Sungold fruits will not reliably grow true to type and may produce variable results.
For consistent sweetness and performance, it is best to grow Sungold tomatoes from fresh seed each year.
When to Stop Sungold Tomato Plants Growing
Towards late summer, usually around August, pinch out the growing tip above the final truss you want to ripen.
This redirects energy into ripening existing fruit rather than producing new flowers that are unlikely to mature before temperatures drop.
As autumn approaches, remove flowers and very small green fruits that will not ripen.
Tips for Maximising Sweetness and Yield
• Grow plants in full sun
• Maintain consistent watering
• Feed regularly but avoid excess nitrogen
• Remove side shoots frequently
• Ensure good airflow and ventilation
• Harvest fruits fully ripe
Attention to these details makes a noticeable difference to flavour and productivity.
Final Thoughts
Sungold tomatoes are prized for their unbeatable sweetness, vibrant colour, and heavy cropping habit. While they require regular care due to their vigorous growth, the rewards are well worth the effort.
With correct sowing, consistent watering, balanced feeding, and proper training, Sungold tomatoes can produce long trusses of sweet, juicy cherry tomatoes over many months. For gardeners who value flavour above all else, Sungold remains one of the finest cherry tomato varieties you can grow.