Solanum betaceum Seeds | Tamarillo
LATIN NAME: Solanum betaceum
COMMON NAME: Tamarillo
Plant Profile
The tamarillo is a fast, short-lived evergreen shrub or small tree that reaches several metres and carries large, soft, oval leaves covered with fine hairs. The leaves release a distinct foetid scent when crushed, a useful field mark, and the plant bears small pinkish-lilac trumpet flowers in drooping clusters before the fruit sets. The fruit is egg-shaped, glossy, and coloured red, orange, or purple, with a firm skin around juicy, tangy flesh divided into two seed cavities.
Inside, the ripe fruit holds many small flat seeds in a translucent pulp that ranges from sweet on the red forms to sharply acid on the darker ones. The skin is bitter and is usually peeled or scored and squeezed, which is why the fruit is eaten with a spoon rather than bitten like a tomato.
Older books and most seed lists still file the plant under Cyphomandra betacea, a generic name once split from Solanum for the tree-tomato group. Modern taxonomy folds Cyphomandra back into Solanum, so the correct binomial is Solanum betaceum, but the old name is so entrenched in nurseries and catalogues that growers meet it constantly. Either way the plant is the same Andean tree fruit, and the synonym is worth knowing when you search for rootstock or pollination advice.
The former Cyphomandra holds several lesser-known relatives, but the tamarillo is the one grown for fruit at scale. It is not the same as the naranjilla or the pepino, which are separate Solanum species with their own crops, and it is far removed from the common tomato despite the shared family and the old tree-tomato name.
Beyond New Zealand the crop has found a footing in the highland tropics of Colombia and Ecuador, where the cool nights suit it, and in parts of Kenya and India it is grown for both the local market and for processing. The spread tracks the same climate rule everywhere: mild days, cool nights, and freedom from hard frost at flowering, because a cold snap on the open bloom can spoil a whole setting.
Science & Biotechnology
The pulp is notably rich in pectin, which is why tamarillo cooks down into a thick sauce, and it carries a strong load of vitamin C and a suite of anthocyanins in the skins of the red and purple forms. The flavour rests on a balance of citric and malic acid with a low sugar level, so the fruit reads as refreshing rather than sweet and pairs well with sugar, cream, or savoury chilli salt.
Colour tracks chemistry: the darker the skin, the more anthocyanin and the sharper the taste, while gold forms are milder and a little sweeter. Cooking mellows the acid and sets the pectin, which is why the fruit shines in chutney, jam, and a strained coulis over ice cream.
Uses & Benefits
The fruit we call tamarillo was sold for decades as the tree tomato, a name that did it no favours because shoppers expected a tomato on a trunk. In 1967 a New Zealand promotion led by the country’s fruit and crop authorities coined the name tamarillo, blending tomato with the Maori-sounding ending to give the crop its own identity, and the rebrand worked: within a few seasons the fruit had a market of its own as a tangy, novel breakfast fruit rather than a tomato substitute. New Zealand remains the best-known commercial source, with orchards supplying both the local table and export trade.
Growing from Seed
Wild tamarillo comes from the cool Andean foothills, which is why it prefers a frost-free but not torrid climate and dislikes heavy humidity at the flower. Commercial plantings cluster where nights are cool and days mild, and the plant crops within two seasons from seed, which makes it attractive to small growers who want a quick return. In New Zealand the fruit ripens through autumn, filling the gap left by summer stone fruit.
Fresh seed from a ripe fruit sows readily; clean the pulp off, sow into a warm, free-draining mix, and press the seed to the surface because light helps it along. Keep the tray on a warm bench and the seedlings appear quickly, after which they grow fast and should be potted before they tangle. Because the plant is short lived, most orchards renew their stock every few seasons rather than treat it as a permanent tree.
Young plants hate cold and hate wet feet in equal measure, so move them into individual pots of open mix and harden them slowly. A warm, sheltered site with morning sun and afternoon shade suits the foliage best, and a mulch keeps the shallow root cool through the heat.
Our Take
I grow tamarillo for the novelty and the sauce, and the 1967 name change is the best story to tell at the table. To see its close relatives, follow the tree tomato listing, the naranjilla page, and the pepino notes, all members of the same broad Solanum circle. Buy a named fruiting form if you can, since seedlings vary in flavour and in how freely they set fruit.
Related Reading
More species in the same orbit as Tamarillo: