Elaeocarpus angustifolius
| Blue quandong (Elaeocarpus angustifolius) | |
|---|---|
| Scientific name | Elaeocarpus angustifolius [1] |
| Common names | Blue quandong; Blue Marble Tree [2] |
| Genus | Elaeocarpus |
| Family | Elaeocarpaceae |
| Order | Oxalidales |
| Growth habit | Evergreen tree |
| Mature height | Up to 35 m [3] |
| Native climate | Wet tropical [3] |
| Fruit | Bright blue, roughly spherical drupe, about 15–23 mm across [4] |
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Elaeocarpus angustifolius is an evergreen rainforest tree known as Blue quandong or Blue Marble Tree. Its native range extends from China through Malesia to Australia and the south-west Pacific, in wet tropical settings that include rainforest and secondary forest. [3][5]
Description[edit | edit source]
The tree can become large and may develop buttress roots. It is associated with rainforest and secondary-forest habitats and remains evergreen in warm, moist climates. [3][4] Its eventual size and root development make long-term container culture a staging or training option rather than a natural endpoint.
The fruit is a bright blue, approximately spherical drupe about 15–23 mm across. The blue surface colour is a structural effect rather than ordinary blue flesh, and fruit and stone characters vary among regional material. [4][5]
Cultivation[edit | edit source]
Soil and water[edit | edit source]
In its native rainforest and secondary-forest setting, Elaeocarpus angustifolius grows where warmth and moisture are reliable. Use fertile, humus-rich soil that retains moisture but drains freely; a slightly acid root zone around pH 5.5–6.5 is the stated horticultural preference. [4] Keep young plants evenly supplied with water during active warm growth, while avoiding stagnant saturation around the roots. A site or container should allow for vigorous root development and rapid drainage rather than a shallow, chronically wet root zone.
Sun and humidity[edit | edit source]
Full sun is preferred, although some shade is tolerated. [4] Give a young plant bright light with protection from abrupt exposure changes, then increase sun as its root system establishes. Warm, humid air and good airflow fit the wet-tropical habitat better than a cool, stagnant enclosure. [3]
Seasonal changes[edit | edit source]
The species is evergreen and associated with warm, moist tropical conditions. [3] As a genus-level cultivation inference, maintain steady root-zone moisture through warm active growth and reduce irrigation only when cooler or drier weather slows uptake; do not impose a deliberate dry dormancy. Drainage remains important when rain or irrigation is frequent. A fixed flowering calendar and a species-specific cold threshold are not assigned here.
Propagation[edit | edit source]
Seed is the primary propagation route in the species treatment. The hard, woody seed can germinate slowly and erratically. [4] Sow clean seed in a free-draining medium in light shade and keep it evenly moist without waterlogging; avoid treating an individual germination time as a dependable schedule.
The following are genus-level propagation methods rather than species-specific success guarantees: carefully filing the shell or cracking it enough to admit moisture may speed germination, but damage to the embryo can ruin the seed; almost-ripe shoots may be tried in sandy soil. [4] Handle seedlings gently during transplanting and move them before a large root system makes disturbance more difficult.
Flowering, fruiting, and harvest[edit | edit source]
The flowers are described as creamy, and the fruit develops into a vivid blue drupe. [4][5] Fruit colour and stone form vary among regional material; measurements associated with plants identified as Elaeocarpus grandis should not be transferred to E. angustifolius without confirming the identification. [5]
Harvest timing is best judged from fully developed fruit colour and local experience with correctly identified trees. A universal bearing age, crop calendar, or yield should not be assumed from a single regional account.
Fruit and uses[edit | edit source]
Ripe fruit is used as food in parts of the species' range. Such use does not establish a universal preparation or safety rule: use only correctly identified fruit and follow established local culinary practice. [4]
The hard stone and vivid blue outer colour are distinctive features, while the edible portion and flavour can vary with provenance and maturity. [4][5]
Photos[edit | edit source]
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References[edit | edit source]
Image credits[edit | edit source]
- Blaue Früchte (30687165914).jpg: photograph by Theo Crazzolara, Wikimedia Commons; CC BY 2.0. File page.
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- Blue Marble Closeup - Hoomaluhia Botanical Garden.jpg: photograph by Daniel Ramirez, Wikimedia Commons; CC BY 2.0. File page.
- Starr-090519-8097-Elaeocarpus angustifolius-leaves-Kula-Maui (24837780352).jpg: photograph by Forest and Kim Starr, Wikimedia Commons; CC BY 3.0 US. File page.
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