Sweetie Tomato

The sweetest cherry tomatoes are all hybrids. Sweetie is the open pollinated exception.

Sweet 100, Sungold, Sun Sugar. The most popular sweet cherry tomatoes in American gardens are F1 hybrids. Seeds saved from the fruit don’t grow true. You buy new seed every season.

Petoseed introduced Sweetie in 1980, right at the start of the sweet cherry tomato wave in home gardens. It was open pollinated. Seeds run true. You save from your best fruit and grow the same plant the following year.

What makes that meaningful is the sugar content. Sweetie hits 12 to 14 percent sugar, which puts it in the same range as hybrid sweet types. The sweetness is real and consistent across seasons and seed generations. For gardeners who save seed, that combination is rare in a cherry tomato. For everyone else, it’s a very sweet, very prolific variety that produces from midsummer through frost from genetics you own and control.

What the fruit is like

Sweetie produces round cherry tomatoes, three quarters to one inch across. Most fruit weighs about an ounce. The color is deep, glossy red at full ripeness. The clusters are large, 15 to 20 tomatoes per truss, hanging in bunches up and down the vine throughout the season.

The skin is thin enough to burst pleasantly but firm enough to hold up in a bowl or salad for a day or two without collapsing. The flesh is juicy and fairly dense for a cherry tomato. Lower water content than many cherry types. That’s part of why the sugar reads so high.

The flavor is sweet and mild. Very low acidity. Almost no sharpness. This is the tomato that converts people who claim they don’t like tomatoes. The sweetness is the whole flavor story. There’s not much tartness to balance it or complexity to discover behind it. What you get is clean, uncomplicated tomato sweetness in a package you can eat whole.

Days to maturity: 75 days from transplant. Early to mid season. First fruit arrives in midsummer in most climates and the plant keeps producing until frost.

The disease resistance picture

This is where Sweetie shows its age as a 1980 open pollinated variety.

Sweetie carries no VFN resistance. No coding against Fusarium wilt, Verticillium wilt, or nematodes. That’s the standard resistance package most modern hybrids include as a baseline. Sweetie skips all of it. In clean soil with good rotation, this rarely causes serious problems. The plant is vigorous and productive in healthy beds. In gardens with a history of wilt or nematode pressure, it declines faster than a resistant variety.

Some sources note resistance to Alternaria stem canker, which is a specific disease distinct from the common early blight most gardeners deal with. That protection is noted but won’t change most home garden situations. The more important fact for most growers is the lack of VFN.

How to grow Sweetie, start to finish

Starting seeds

Start indoors 6 to 8 weeks before your last frost date. Sow seeds a quarter inch deep in a clean seed starting mix. Keep soil temperature between 70 and 80°F. A heat mat keeps germination fast and consistent in early spring when room temperatures are still variable.

Set up fluorescent or LED grow lights close to the canopy the day seedlings emerge. Keep them 2 to 3 inches above the plant tops. Raise them as growth continues. Sweetie is a vigorous indeterminate that reaches 6 to 8 feet. A seedling that stretches toward distant light builds a weak stem that struggles under heavy cluster loads later in the season.

Pot up to individual containers when the first true leaves appear. Feed weekly at half strength with a balanced liquid fertilizer from that point through transplant day. A seedling that is well fed establishes in the garden ahead of anything that was cramped or underfed during the seedling phase.

Sweetie is open pollinated and grows true from saved seed. Scoop seeds and gel from a fully ripe fruit into a jar of water. Ferment for 2 to 3 days. Rinse and dry flat. Store somewhere cool and dry until spring. Save from the sweetest, most productive plants each season and you select toward a stronger population over time. This is the advantage the hybrid sweet cherry types can’t offer.

Transplanting

Move plants outside after your last frost date, once nights hold reliably above 50°F. Cold nights below 54°F during flower formation cause catfacing. Sweetie produces small cherry fruit, so catfacing is minor and rarely noticeable. Cool nights during flower formation still affect early set and quality.

Harden off over 7 to 10 days. Set plants outside for increasing periods each day before leaving them out permanently. Indoor seedlings moved directly to full outdoor sun and wind experience shock. A proper hardening period prevents the setback that slows establishment at the exact moment you want roots going down aggressively.

Bury two thirds of the stem at planting. Tomatoes produce roots along any buried stem section. Strip any leaves that would go below soil level. More root depth means more drought tolerance and better stability for a vine that carries hundreds of small fruit through a long season.

Space plants 24 to 36 inches apart. Sweetie builds a full canopy and produces heavily. Crowded plants trap warm, humid air around the lower foliage. With no disease resistance to compensate, adequate spacing is one of your primary tools against fungal disease pressure through the season.

Soil and feeding

Rich, well drained soil loaded with compost, pH 6.0 to 6.8. Work a balanced organic fertilizer into the planting hole before setting the plant in. This slow release base supports root development without pushing sudden leafy growth in the first weeks after transplant.

Switch to a lower nitrogen tomato feed once the first flowers open. High nitrogen after flowering drives leaf growth at the expense of fruit. Feed every two weeks through the full season. Sweetie produces from mid season through frost. Tapering off nutrition in August while the plant is still setting clusters is a common mistake that cuts your late season harvest short.

Sweetie’s small fruit size and lower water content reduce blossom end rot risk compared to large fruited varieties. Consistent moisture still matters for fruit quality and crack prevention. Keep watering even throughout the season and the risk stays low.

Light and water

Full sun, 8 hours minimum. Sweetie needs full heat and light to concentrate the sugar content that defines the variety. Partial shade extends time to first fruit and reduces both yield and the sweetness that makes this tomato worth growing.

Water deeply and consistently at the base of the plant. Target 1 to 2 inches per week. Sweetie’s crack resistance is decent for a red cherry tomato but not exceptional. Consistent moisture prevents the wet to dry swings that split ripe fruit on the vine. A drip line or soaker hose delivers water where it’s needed without wetting the foliage.

Lay 2 to 3 inches of straw mulch around the plant after a deep watering. Mulch stabilizes soil moisture between rain events. It reduces temperature swings in the root zone during hot weeks. It also stops disease spores from splashing up onto lower leaves during rain, which matters on a variety with no coded disease resistance.

Support and pruning

Sweetie is fully indeterminate. In good soil it reaches 6 to 8 feet and keeps growing until frost. Standard short cages collapse under this plant by midsummer. Use a heavy duty cage at least 6 feet tall, tall sturdy stakes, or a trellis system. Set the support at planting before roots spread.

Tie growing stems to the support with soft plant ties or strips of fabric. Nothing that cuts into swelling stems. Check and adjust ties every two weeks through the season. Clusters of 15 to 20 small tomatoes add surprising weight to branches as fruit sets across the full length of the vine.

Remove suckers below the first flower cluster. This keeps the lower canopy open for airflow. Above the first cluster, let the plant develop two to three main leaders. Sweetie produces its best yield on those upper branches and the clusters that form along them. Aggressive sucker removal above the first cluster reduces total harvest without improving individual fruit quality.

Strip any foliage touching the ground. Soil to leaf contact is the primary entry route for early blight spores. Keep the lowest foot of the plant clear throughout the season. Strip spotted leaves the day you see them. Sweetie has no early blight resistance to slow a developing infection.

Problems to watch

No VFN disease resistance. The main limitation. In beds with Fusarium, Verticillium, or nematode pressure, Sweetie declines faster than a resistant variety. Rotate beds each season. Water at the soil. Rapid wilting in an otherwise healthy looking plant often points to soil disease. Strip spotted lower leaves the day you see them and don’t let problems get ahead of you.

Early blight. No resistance. Brown spots with concentric rings on lower leaves, climbing from the base. Strip affected leaves immediately. Keep foliage dry. Rotate beds each season. On an unresistant plant, early blight climbs fast in a wet summer once it gets established on the lower canopy.

Cracking. Sweetie’s crack resistance is decent but not exceptional. A rain surge after a dry stretch splits ripe fruit. Pick at full red rather than letting fully ripe fruit sit on the vine before rain. Consistent moisture and thick mulch prevent most splitting. Our tomato fruit problem guide covers cracking and every other common fruit symptom in detail.

Catfacing. Cool nights below 54°F during flower formation cause it. On small cherry fruit it’s barely noticeable. First flush fruit may show minor scarring at the blossom end. Safe to eat. Midseason fruit from the same plant comes in clean.

Overproduction. Sweetie is genuinely prolific. At peak season a single vine produces more than most households can eat fresh. Eat them off the vine by the handful. Freeze them whole for winter sauces. Share them with neighbors. Have a plan before the plant hits its stride or you’ll be overwhelmed by late July.

Hornworms. A 6 to 8 foot vine loaded with clusters of cherry tomatoes is exactly what they target. Check undersides of leaves and look for stripped stems weekly through summer. Dark droppings on the ground below a branch are the sign. Handpick or treat with Bt at first appearance.

Container growing

Sweetie handles containers better than most indeterminate tomatoes of comparable production. The fruit is small and the clusters distribute their weight across the vine rather than concentrating it on a few large fruits. The vine still reaches 6 to 8 feet and needs genuine support.

Use a 10 gallon container of quality potting mix at minimum. Many growers go to 15 gallons for better results through a long season. Set a tall stake or heavy duty cage at planting. Water daily in summer heat. Feed every week to 10 days because containers flush nutrients faster than ground beds. Expect slightly lower yield than a ground planted vine but reasonable production if moisture and nutrition stay consistent.

Among indeterminate cherry tomatoes, Sweetie is a realistic container option. The small fruit and cluster growth habit make it more manageable than a vine carrying large beefsteak tomatoes. In ground is still where it performs best.

Our guide to growing tomatoes in pots covers container growing in full.

Sweetie vs other sweet cherry tomatoes

Sweet 100 is the closest comparison on production volume and sweetness. Both are prolific red cherry tomatoes with high sugar content. Sweet 100 is a hybrid; Sweetie is open pollinated. For seed savers, Sweetie wins by default. For maximum production without seed saving as a priority, Sweet 100 offers higher yield potential as a hybrid. Both crack under moisture stress, and neither carries strong disease resistance.

Sun Sugar is the orange cherry comparison. Sun Sugar hits exceptional sweetness through low acid chemistry. Sweetie reaches comparable sweetness through high sugar content in a red fruit. Both are prolific producers through a long season. Sun Sugar is a hybrid with better crack resistance than most orange cherry types. Sweetie is open pollinated with decent crack resistance for a red cherry. They appeal to different grower priorities as much as different flavor preferences.

Our heirloom tomato guide puts Sweetie alongside the full cherry family with flavor and timing compared.

The verdict

Sweetie has been in American gardens since 1980. Four decades of consistent performance, and it earns that longevity. The flavor delivers on the name every season. The clusters are genuinely prolific. And the open pollinated genetics mean you save seed, improve your population, and grow the same tomato without buying new seed each year.

Its limitation is clear: no VFN resistance. In clean soil that’s manageable. In problem beds, plant a resistant variety alongside for comparison.

Give it full sun, consistent moisture, real support from planting day, and a plan for what to do with the excess. Eat them fresh, freeze them, share them. A single vine at peak season produces more than most people expect. That’s the Sweetie experience. Our growing tomatoes guide covers the full season timing for early to mid season cherry varieties like this one.