Description

This is one of the most intriguing and impressive Psidium materials we have ever been able to offer.

Psidium cf. ubatubense is an ultra-rare Atlantic Forest Psidium associated with the region of Ubatuba, São Paulo, Brazil. The mother tree is reported from Ubatuba and, according to the collector, is an exceptionally large tree — nearly 30 meters tall — producing good-sized yellow to orange-yellow fruits with a pleasant acidulated flavor.

And honestly, based on the photos, this does not look like an ordinary Psidium cattleyanum or common strawberry guava type.

The tree is massive, with a striking mature trunk, exfoliating bark, and a canopy structure that gives the impression of an old Atlantic Forest giant rather than a small backyard guava shrub. The fruits are rounded, yellow-orange when ripe, with pale juicy pulp and a flavor described by the collector as acidulated but very good.

For serious Psidium collectors, this is exactly the kind of material that deserves attention: rare origin, unusual tree habit, good fruit size, distinctive morphology, and very limited seed availability.

Why this material is special

Most people know Psidium through common guavas, strawberry guavas, or smaller arazá-type fruits. This one appears to be something else.

The photos show a very distinctive plant:

A large Atlantic Forest tree, not a typical small shrub.
A thick, mature, exfoliating Myrtaceae-style trunk.
Good-sized yellow-orange fruits.
Pale juicy pulp with a sweet-acid profile.
Origin from Ubatuba, one of the most biodiverse coastal Atlantic Forest regions of Brazil.
Extremely rare in cultivation and almost never available internationally.

This is the kind of Psidium that serious collectors chase not only for the fruit, but also for the genetics, rarity, and botanical value.

Fruit description

The fruits are rounded and ripen to a yellow or light orange-yellow color, with some brownish/russet markings on the skin when fully mature. The pulp is pale, juicy, and translucent-creamy, with an acidulated but pleasant flavor.

The collector described the fruit as:

“Sabor acidulado mas é gostoso”
— acidulated flavor, but tasty.

That description is important. Many rare fruits are marketed only because they are rare. This one seems to have both rarity and real eating potential.

It may not be a candy-sweet tropical fruit; rather, it appears to belong to the better class of arazá/guava relatives with a refreshing sweet-acid balance — the kind of flavor that can be very useful for fresh eating, juices, preserves, and breeding work.

Tree habit

The mother plant is reported as an enormous tree from Ubatuba, almost 30 meters tall. Even allowing for collector approximation, the photos clearly show a large, old, forest-type tree, far beyond the usual habit of common cultivated strawberry guavas.

This is one of the strongest reasons why I believe this material should not be treated casually as just another Psidium cattleyanum form.

The trunk, scale, and overall habit suggest a very distinctive Atlantic Forest Psidium lineage, and for collectors this makes the plant especially valuable.

Taxonomic note

This material is offered as Psidium cf. ubatubense.

The “cf.” means “compare with” and is used when a plant strongly resembles a given taxon but the identification is kept cautious. This is the most honest and botanically responsible way to offer rare material like this.

Brazilian botanical sources recognize Psidium ubatubense Mattos, while some international databases may treat the name within the broader Psidium cattleyanum complex. However, the living material shown in these photos appears clearly distinct from ordinary cultivated P. cattleyanum forms, especially in tree size, habit, fruit appearance, and origin.

So the best practical name for this seed lot is:

Psidium cf. ubatubense — Giant Ubatuba Atlantic Forest Arazá

This keeps the identification serious, while also recognizing that this is a remarkable and unusual Psidium from Ubatuba.

Origin story

These seeds come from a rare Ubatuba-origin plant known by the collector in Brazil. The tree is described as extremely large and old, growing in an Atlantic Forest setting. The fruits are not commonly available, and seeds of this material are very rarely offered.

Ubatuba is a legendary region for Atlantic Forest biodiversity. Many rare Myrtaceae, Sapotaceae, Annonaceae, and other fruiting trees occur in this coastal forest environment, and some are still poorly known in cultivation.

For collectors of rare Brazilian fruit trees, a distinctive Psidium from Ubatuba is already interesting. But a giant-tree form with good-sized edible fruits is much more than interesting — it is a serious conservation and collection opportunity.

Growing information

Like most tropical and subtropical Psidium, seeds should be planted fresh.

Recommended sowing method:

Sow in a well-draining but moisture-retentive substrate.
Use peat, coco fiber, fine compost, perlite, or vermiculite-based mixes.
Keep warm, ideally around 24–30°C.
Keep humid but never waterlogged.
Provide bright shade or filtered light for seedlings.
Avoid strong direct sun while young.
Do not allow seeds to dry out completely.

Fresh Psidium seeds often germinate irregularly. Some may sprout quickly, while others may take longer. Warmth, stable moisture, and patience are important.

Because this is a rare Atlantic Forest material, I recommend growing seedlings carefully during the first year, protecting them from drought, extreme cold, and intense afternoon sun.

Climate potential

Exact cold tolerance is not well documented for this material. However, many Psidium species from southeastern Brazil show some degree of subtropical adaptability once established.

As a cautious estimate, this plant should be considered tropical to subtropical, suitable for warm humid climates and protected subtropical gardens. Young seedlings should be protected from frost.

Possible zones:
USDA 10+ outdoors
USDA 9b with protection / experimentation
Container culture in colder areas

Collectors in marginal climates should grow it in pots first and protect young plants during winter.

Why collectors should not miss this

This is not a common guava.
This is not a normal strawberry guava.
This is not another ordinary arazá.

This is a rare Atlantic Forest Psidium from Ubatuba, with a huge mother tree, good-sized yellow-orange fruits, edible sweet-acid pulp, and very little known presence in cultivation.

For collectors specializing in rare Myrtaceae, Brazilian fruits, Atlantic Forest species, or unusual Psidium, this is a highly desirable seed lot.

Once these seeds are gone, we do not know when this material will be available again.