Isis Candy Tomato

The Isis Candy tomato is a small, bicolor cherry tomato. It is known for a distinctive gold and red starburst pattern. Its flavor reputation keeps coming up in the same breath as Sun Gold. Most gardeners treat Sun Gold as the benchmark for sweet cherry tomatoes. It also has a real, traceable origin story that gets muddled in casual conversation more often than it should.

This guide sets the record straight on where Isis Candy actually comes from. It explains the pigment science behind its signature bicolor pattern. And it reports honestly on what independent growers, not seed catalog copy, say about its flavor and performance.

What the Isis Candy tomato actually is

Isis Candy is an open pollinated, indeterminate cherry tomato with regular leaf foliage. It grows as a vigorous vine that commonly reaches 4 to 7 feet. It benefits from sturdy staking or trellising. Days to maturity are most often reported between 67 and 75 days. Figures across sources range as wide as 65 to 80 days. That spread is worth noting, rather than papering over with a single false precise number. Fruit is small, roughly an inch to an inch and a half across and about an ounce. It grows in generous clusters of 6 to 8.

The defining trait is its color: a yellow gold base overlaid with a red to pink blush. This blush most commonly forms a “starburst” or “cat’s eye” pattern radiating out from the blossom end. The interior flesh shows the same gold and red marbling when cut open. This pattern recurs consistently across independent descriptions from Seed Savers Exchange, grower databases, and multiple seed catalogs. That makes it a reliable identifying feature, not an inconsistent marketing flourish.

Where Isis Candy actually came from

The best documented account of this variety’s origin comes directly from Seed Savers Exchange’s own records. Isis Candy was bred by SSE member Joe Bratka of New Jersey. One parent was the heirloom Marizol Purple. It was introduced through Seed Savers Exchange in 1992. A second piece of evidence corroborates this. Bratka is independently documented as the breeder of a related variety, Marizol Bratka, a cross of Brandywine and Marizol Purple made around 1990. That is the same era, using the same parent stock. That consistency across two separate breeding projects makes the New Jersey origin story more credible than many single sourced heirloom claims.

We want to be clear about what is not documented. No source gives a first name confirmation beyond “Joe.” No photograph exists either, nor an original Seed Savers Yearbook accession record we could independently retrieve. So we rate this account as moderate to high confidence, not an airtight fact. We also found no source anywhere connecting Isis Candy to Alan Kapuler or Peace Seeds. That is an Oregon breeding program sometimes assumed to be behind unusual heirloom tomato crosses of this era. If you have seen that attribution repeated somewhere, treat it as unverified until a primary source turns up. The New Jersey story is the one with actual institutional backing.

The science behind the bicolor pattern

Tomato fruit color is controlled by at least two separate, independent pigment systems. This distinction explains a lot about why different colorful tomatoes look the way they do. One system is the carotenoid pathway working in the flesh and pericarp. It governs the balance between red lycopene and orange to yellow beta carotene. The other is the flavonoid or anthocyanin pathway. It works mainly in the fruit’s skin, controlled by a different set of genes entirely. This second pathway is responsible for the dark purple to near black blush seen on newer “indigo” style tomatoes. Those varieties were bred using genetics from wild tomato relatives.

Isis Candy’s bicolor look is a carotenoid distribution effect. It comes from a yellow, beta carotene rich base. Lycopene concentrates in certain zones of the fruit rather than spreading evenly, producing the streaked or starburst pattern. This is mechanistically distinct from the anthocyanin based bicolor blush on indigo type tomatoes. It is a useful distinction for any gardener wondering why two very differently colored “bicolor” tomatoes can work through completely separate genetic systems. We should be honest, though. The precise genetic basis of Isis Candy’s specific marbled starburst pattern, as opposed to a simple streak, has not been definitively mapped in the published literature. So this explanation describes the general mechanism understood for bicolor carotenoid tomatoes, not a study conducted on this variety specifically.

Why growers report such strong flavor

Independent grower reports on this variety are unusually consistent and unusually positive. Growers describe it as intensely sweet and fruity. More than one independent account names it among the best tasting cherry tomatoes they have grown. At least one detailed comparison reported preferring it over Sun Gold, by a wide margin in a side by side taste test. Sun Gold is the tomato most gardeners treat as the flavor benchmark for sweet cherries. Texture reports are similarly consistent: tender skin, juicy interior, and notably not mealy. Mealiness is a complaint that does affect some other high sugar cherry varieties.

There is a plausible chemical explanation for this reputation. Peer reviewed research compared cherry tomatoes of different flesh colors. It found that yellow fleshed types carried the highest soluble sugar content of the colors tested. They also carried markedly lower acid than a deep colored comparison variety. That combination reads to the palate as bright sweetness, not the more balanced sweet tart profile of a standard red cherry tomato. Isis Candy’s flesh is predominantly yellow gold. This general finding offers a reasonable, scientifically grounded explanation for its flavor reputation, then. We want to be precise, though. This study did not test Isis Candy itself. Treat this as informed by analogy to the closest studied proxy, not a direct finding about this cultivar.

Problems to watch for

With no documented disease resistance, this variety carries the same general risk profile as any unimproved open pollinated tomato. Our tomato disease guide covers common pressures and how good spacing and airflow help. Thin skinned cherry tomatoes like Isis Candy are also genuinely more prone to cracking than thicker skinned slicers. University extension research is consistent on the mechanism. Cracking happens when the fruit’s skin cannot expand as fast as the interior during a rapid growth spurt. Heavy rain or a sudden watering after a dry stretch typically triggers it. Many cherry tomato varieties show higher susceptibility, due to thin, less elastic skin. Our tomato fruit problem guide covers cracking alongside other common issues.

Excess nitrogen fertilizer and a rapid swing from drought stress to heavy watering are two of the most common practical triggers for cracking on a thin skinned variety like this. Consistent moisture management matters more here, then, than for a thicker skinned slicing tomato. Vigorous vine growth also means this variety can shade itself out if left unpruned. That can slow ripening and reduce airflow around fruit clusters. It is another reason routine sucker pruning pays off over a full season.

Growing the Isis Candy tomato

Starting and transplanting

Start seeds indoors 4 to 6 weeks before your last frost date, with germination typically taking 7 to 14 days in warm conditions. Transplant outside after frost danger passes, once the soil has warmed.

Spacing, support, water, and feeding

Space plants 24 to 36 inches apart to give this vigorous indeterminate vine room to grow. Set a sturdy stake, cage, or trellis at planting time. Water deeply and evenly, rather than letting the soil swing between dry and soaked. That is the single most effective step against cracking on a thin skinned cherry type. Our guide to watering tomatoes covers a consistent routine. Feed at a moderate, balanced rate. Our guide to fertilizing tomatoes covers timing that supports fruit development without pushing excess foliage. For best flavor, let fruit fully ripen on the vine rather than picking early. Independent grower reports echo this point consistently.

Isis Candy vs Black Cherry vs Sun Sugar

Black Cherry highlights two entirely different pigment stories and two different flavor styles by comparison. Black Cherry is a dusky purple brown anthocyanin family dark tomato with a deep, smoky, wine like flavor profile. Isis Candy is a bright yellow gold carotenoid bicolor instead, with a fruity, candy like sweetness. Both are open pollinated, named breeder varieties from the modern heirloom revival era, not ancient landraces. That is a nice structural parallel, even though their colors and flavors diverge sharply. Choose Black Cherry for complex, savory sweet depth. Choose Isis Candy for maximum bright sweetness and visual novelty.

Against Sun Sugar, the clearest differentiator is breeding type, not flavor. Both are genuinely sweet golden cherry tomatoes. Sun Sugar is a modern F1 hybrid, meaning seed cannot be saved true to type and must be repurchased each season. Isis Candy is open pollinated and fully seed saveable instead, a meaningful distinction for gardeners building a self sufficient seed supply. Sun Sugar also tends to mature a little faster, benefiting from typical hybrid vigor and more uniform production. Isis Candy offers the bicolor visual novelty in exchange, and per at least one detailed grower comparison, a flavor some tasters rate even higher.

The verdict

Isis Candy tomato is a genuinely excellent tasting bicolor cherry. It has a real, reasonably well documented origin through a named Seed Savers Exchange breeder. A plausible chemical explanation backs why yellow fleshed types like this one taste so consistently sweet. What it is not is a Kapuler or Peace Seeds breeding project. We could not verify that claim anywhere. It is also not immune to the cracking risk common to any thin skinned cherry tomato.

Grow it if you want one of the most visually distinctive and consistently well reviewed sweet cherry tomatoes, in an open pollinated, seed saveable form. Consider Sun Sugar instead if you want a faster maturing hybrid with more production uniformity. Consider Black Cherry if you prefer a deeper, more complex flavor over bright sweetness. Whichever you choose, give the fruit the full ripening time growers consistently recommend. That is the single easiest way to get the best out of any of these three.

Frequently asked questions

Where does Isis Candy tomato actually come from?

The best documented account credits Seed Savers Exchange member Joe Bratka of New Jersey as the breeder, with Marizol Purple as one parent. It was introduced through Seed Savers Exchange in 1992. We rate this moderate to high confidence.

Is Isis Candy the same tomato bred by Alan Kapuler in Oregon?

No, and this appears to be a mix up. We found no source connecting Isis Candy to Kapuler or Peace Seeds. The well corroborated origin points to Joe Bratka in New Jersey.

Why is Isis Candy so much sweeter than a typical cherry tomato?

Peer reviewed research has found yellow fleshed cherry tomatoes tend to carry higher sugar and lower acid than red fleshed types. That likely explains the intense sweetness, though no study has tested this variety specifically.

What causes the bicolor starburst pattern on Isis Candy fruit?

It is a carotenoid pigment distribution effect, distinct from the anthocyanin pigment responsible for the blush on newer indigo varieties. The precise genetics of the marbled pattern itself have not been mapped in the literature.

Is Isis Candy prone to cracking?

Yes, as is typical for thin skinned cherry tomatoes. Even, consistent watering is the best prevention against the rapid growth spurts that cause cracking.