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| {{Fruit infobox
| | #REDIRECT [[Syzygium jambos]] |
| | common_name = Rose apple
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| | scientific_name = ''Syzygium jambos'' (L.) Alston
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| | family = Myrtaceae
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| | fruit_type = Fleshy berry
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| | growth_form = Evergreen tree
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| | mature_height = About 9–12 m in many descriptions; larger trees may occur
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| | mature_width = Not consistently reported
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| | hardiness = Tropical to warm subtropical; frost-sensitive when young
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| | germination = About 10–120 days when fresh seed is sown under suitable conditions
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| | stratification = Not generally required; fresh seed preferred
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| | years_to_fruit = From about 4 years reported in some sources; variable by plant and conditions
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| | pollination = Flowers visited by bees and other insects; cultivar-specific self-compatibility needs confirmation
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| | harvest = Usually seasonal; timing varies by climate
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| | status = Source-backed, with variable field values
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| }}
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| '''Rose apple''' is a common name most often used for '''''Syzygium jambos''''', an evergreen fruit tree in the family Myrtaceae. The name is also used for other ''Syzygium'' species, so the scientific name should be confirmed before applying growing information.
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| ''S. jambos'' is valued for its fragrant flowers and pale yellow to pinkish fruit, which may have a rose-like aroma or flavor. The species has been introduced widely outside its native range and is considered invasive in some regions; local planting and seed-dispersal rules should be checked before cultivation.
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| == Gardener's summary ==
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| {| class="wikitable"
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| ! Attribute !! Working record !! Evidence / caution
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| |-
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| | Identity || ''Syzygium jambos'' || Common name is shared with other ''Syzygium'' species
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| |-
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| | Climate || Tropical to warm subtropical || Protect young trees from frost
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| |-
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| | Soil || Well-drained soil is the safest starting point || Confirm local soil and rainfall requirements
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| |-
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| | Sun || Full sun is generally preferred for fruiting || Young plants may need protection in extreme heat
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| | Water || Regular moisture during establishment || Avoid persistently waterlogged soil
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| |-
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| | Mature size || Approximately 9–12 m often reported || Pruning and site conditions can change size
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| |-
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| | Propagation || Fresh seed; cuttings may also be used || Seed viability is short according to horticultural references
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| |-
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| | First fruiting || About 4 years reported in some references || Strongly dependent on provenance and growing conditions
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| |-
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| | Invasiveness || Invasive in some introduced ranges || Check local regulations before planting
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| |}
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| == Identification ==
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| Rose apple should not be identified by its common name alone. Confirm the species using a botanical reference, herbarium material, nursery provenance, or diagnostic photographs. Useful distinguishing records include:
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| * Leaf shape, size, texture, and scent when crushed
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| * Flower color, filament arrangement, and flower-cluster structure
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| * Fruit shape, skin color, aroma, flesh texture, and seed number
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| * Tree habit, bark, and mature size
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| * Geographic origin and local names
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| == Description ==
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| ''Syzygium jambos'' is described as a tree with a rounded crown and glossy dark-green leaves. Its flowers are showy and borne in clusters, with conspicuous pale filaments. The fruit is generally described as cream, yellow, or pinkish and is associated with a rose-water-like fragrance. Fruit characters vary with tree, climate, maturity, and possibly local selection.
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| == Germination and propagation ==
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| Fresh seed is preferred because reported seed viability is short. Horticultural references commonly report germination in roughly 10–120 days, but this is a broad range rather than a guaranteed schedule. Record the following for a useful garden trial:
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| * Date fruit was harvested
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| * Whether the seed was washed and how soon it was sown
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| * Sowing medium and drainage
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| * Temperature range
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| * Number of seeds sown
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| * Number germinated and dates of emergence
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| * Seedling growth and transplant date
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| Cold stratification is not normally listed as a requirement for fresh seed. Do not allow seed to dry out unless a source specifically supports that storage method.
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| == Flowering, pollination, and fruiting ==
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| The flowers attract bees and other insects. Some sources report fruiting from approximately four years of age, but time to fruit can vary substantially with seedling versus vegetatively propagated plants, climate, soil, and stress. Treat any exact age or yield claim as site-specific unless it is backed by a cultivar or trial record.
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| == Fruit and uses ==
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| Ripe fruit is commonly eaten fresh and may also be cooked or made into preserves. Descriptions often mention a delicate, rose-like aroma. Record flavor, texture, seediness, and storage life from the actual tree being documented rather than transferring those traits from another species called rose apple.
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| == Pests, diseases, and ecological caution ==
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| The species can naturalize outside cultivation. In some regions it is regarded as invasive because animals disperse its seeds and the tree can establish in disturbed or natural habitats. Before planting, check local invasive-plant databases and avoid releasing viable seed where the species is restricted.
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| == Cultivars, varieties, and local selections ==
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| === Documented named cultivars ===
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| No reliable, internationally standardized list of formally named cultivars of ''Syzygium jambos'' was found in the sources reviewed for this page. Major references generally discuss the species as a whole rather than describing a stable set of registered cultivars. Nursery listings using names such as "rose apple", "jambu mawar", "yambo", or "pomarrosa" should therefore not automatically be treated as cultivar names.
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| === Selection types to document ===
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| These are useful horticultural descriptors, but they are '''not formal cultivar names''' unless a source establishes them as such:
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| {| class="wikitable"
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| ! Selection type !! Characteristics to record !! Verification needed
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| | Local seedling selection || Provenance, fruit color, flavor, seed count, tree size, and fruiting season || Photograph, location, source history, and repeated observation
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| | Pink- or red-fruited selection || Exact ripe color, maturity stage, aroma, and flesh characteristics || Multiple fruiting seasons and comparison with a verified ''S. jambos'' specimen
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| | Cream- or yellow-fruited selection || Skin color, fruit size, texture, and flavor || Multiple trees or a documented propagated clone
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| | Large-fruited selection || Fruit dimensions, mass, seed number, and yield || Measurements from a representative harvest
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| |-
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| | Early- or late-fruiting selection || Flowering date, fruit set, and harvest date || Climate, tree age, and at least two seasons of records
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| |}
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| A local selection should receive a provisional name only when its origin and propagation history are recorded. A seedling should not be assumed to reproduce the parent fruit exactly. If a selection is propagated by grafting, cuttings, or another clonal method, record the source tree and the propagation date.
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| === Related species that are not cultivars of ''S. jambos'' ===
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| The following plants may be sold under overlapping common names but are separate species and should have separate wiki entries:
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| * '''Wax apple''' or '''water apple''' — often ''Syzygium samarangense''
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| * '''Malay apple''' — often ''Syzygium malaccense''
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| * '''Java plum''' or '''black plum''' — ''Syzygium cumini''
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| * '''Watery rose apple''' or related local names — sometimes ''Syzygium aqueum''
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| == Similar common names ==
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| * '''Wax apple''' or '''water apple''' — often ''Syzygium samarangense''
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| * '''Malay apple''' — often ''Syzygium malaccense''
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| * '''Java plum''' or '''black plum''' — ''Syzygium cumini''
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| These are related plants but should have separate wiki pages because their fruit, climate requirements, growth habit, and invasive behavior can differ.
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| == Growing record ==
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| {| class="wikitable"
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| ! Date !! Location / climate !! Plant age !! Height !! Flowering !! Fruiting !! Notes
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| |-
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| |}
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| == Sources ==
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| * [https://www.cabidigitallibrary.org/doi/10.1079/cabicompendium.52443 CABI Compendium: ''Syzygium jambos''] — identity, ecology, distribution, impacts, and management information.
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| * [https://www.iucngisd.org/gisd/species.php?sc=920 IUCN Global Invasive Species Database: ''Syzygium jambos''] — invasive-species profile and general tree description.
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| * [https://tropical.theferns.info/viewtropical.php?id=Syzygium+jambos Useful Tropical Plants: ''Syzygium jambos''] — horticultural and propagation reference, including the broad fresh-seed germination range.
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| * [https://apps.worldagroforestry.org/treedb/AFTPDFS/Syzygium_jambos.PDF World Agroforestry tree database: ''Syzygium jambos''] — tree and fruit reference, including an approximate earliest fruiting age.
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| [[Category:Fruits]]
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| [[Category:Tropical fruit trees]]
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| [[Category:Syzygium]]
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| [[Category:Fruit trees with invasive potential]]
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