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World of CitrusWorld of CitrusPoncirus Trifoliata
toehead · Tropical Fruit Forum · Cold Hardy Citrus · April 22nd, 2026
https://www.tropicalfruitforum.com/index.php?topic=59968.msg580675#msg580675 (opens in a new tab)
First-hand forum account, paraphrased; not an independently verified trial.
Accessed
Citrus Genome Database
https://www.citrusgenomedb.org/Analysis/1829479 (opens in a new tab)
Genome resource reviewed against the CGD assembly record and existing variety identity. A Poncirus trifoliata reference from accession ZK8. It supplies a species comparison for this general trifoliate-orange record; it does not establish the sequence of every trifoliate selection.
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Citrus Genome Database
https://www.citrusgenomedb.org/Analysis/1312872 (opens in a new tab)
Genome resource reviewed against the CGD assembly record and existing variety identity. A Poncirus trifoliata reference from accession DPI 50-7. It supplies a species comparison for this general trifoliate-orange record; it does not establish the sequence of every trifoliate selection.
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Oregon State University
https://landscapeplants.oregonstate.edu/plants/poncirus-trifoliata (opens in a new tab)
Landscape-plant profile reviewed for morphology, culture, native range, rootstock use, and its limited pest-and-disease assessment.
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Plants For A Future
https://pfaf.org/user/plant.aspx?LatinName=Poncirus+trifoliata (opens in a new tab)
Plant profile reviewed for UK-context seasonality, reproductive notes, fruit description and uses, cold-hardiness statements, rootstock use, and breeding potential.
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Weird Explorer · YouTube · 2020-04-26
https://www.youtube.com/watch?v=D4aL8PqL_xs (opens in a new tab)
Summary from transcript: The presenter describes raw fruit as seedy and low in juice, with floral grapefruit aroma, strong sourness, lime-grapefruit flavor, and slight bitterness. He reports becoming aware of illness in another person after the prepared drink; causation was not established.
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The Mulberries · YouTube · 2024-11-15
https://www.youtube.com/watch?v=Ub-snHkSb1U (opens in a new tab)
Summary from transcript: The presenter compares standard trifoliate fruit from Stan McKenzie's farm with Poncirus Plus. Standard fruit is described as very seedy, variably hard to peel, gummy, sour, bitter, and not for fresh eating; one standard-fruit Brix reading is 14. Companion scorecard: https://themulberries.org/cold-hardy-citrus-taste-tests/ (image: https://themulberries.org/wp-content/uploads/2026/01/Trifoliate-Orange-724x1024.png).
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Smith's Gardentown · YouTube · 2024-07-13
https://www.youtube.com/watch?v=DMSM5ubW3tE (opens in a new tab)
Summary from transcript: At Dallas Arboretum, the presenter highlights large thorns and says thorny shoots from the base of grafted citrus can be rootstock growth. This does not establish that every thorny citrus shoot is a rootstock sucker.
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Givaudan Citrus Variety Collection at UCR
https://citrusvariety.ucr.edu/crc2554 (opens in a new tab)
Barnes accession page reviewed for its 1869 U.S.-introduction statement; it identifies a specific accession and does not resolve earlier U.S. nursery availability.
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Gerald Klingaman · University of Arkansas System Division of Agriculture · 2007-02-09
Extension history reviewed for Prince Nursery's 1823 listing and Saunders's later popularization; it distinguishes nursery listing from subsequent adoption.
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The Mulberries · The Mulberries
https://themulberries.org/cold-hardy-citrus-taste-tests/ (opens in a new tab)
Companion standard-trifoliate scorecard read from its linked image: https://themulberries.org/wp-content/uploads/2026/01/Trifoliate-Orange-724x1024.png. It is incorporated into the existing Mulberries fruit observation, not added as a separate sample.
Accessed
The Mulberries · YouTube · 2026-07-23
https://www.youtube.com/watch?v=RYuIQDSQa54 (opens in a new tab)
Summary from transcript: The presenter reports that Poncirus trifoliata and related plants in the collection, including Poncirus Plus and Conestoga selections, seem prone to multiple blooms depending on weather. This source supports a tentative local grower observation only; its highlighted Poncirus Plus tree is grafted and must not be treated as a species observation.
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Larry K. Jackson and Stephen H. Futch · University of Florida Institute of Food and Agricultural Sciences
https://ask.ifas.ufl.edu/publication/CH072 (opens in a new tab)
Retrieved UF/IFAS extension page. In Minneola scion context, UF/IFAS names trifoliate orange among slower-growing stocks on which Minneola fruit quality is said to be best. No site, accession, measurements, or trial method is supplied.
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The Mulberries · YouTube · 2026-08-30
https://www.youtube.com/watch?v=X5yaKeSA7Gk (opens in a new tab)
Summary from transcript: English automatic captions reviewed 0:01–37:38 of 37:40. Informal late-August/early-September North Carolina comparison; captions are source evidence, not an independent visual measurement check.
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Plant Lust, LLC
https://plantlust.com/plants/27899/clementine-de-nules-mandarin/ (opens in a new tab)
Incidental Plant Lust recommendation card shown on the supplied Clemenules page; listing guidance only, with no specific specimen, rootstock, site conditions, or measurement method.
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Patrícia Marluci da Conceição; Fernando Alves de Azevedo; Gerhard Vitor Ecker; Marilia Morelli; Mariangela Cristofani-Yaly · Comunicata Scientiae · 2019-12-31
https://www.comunicatascientiae.com.br/comunicata/article/view/3138 (opens in a new tab)
Seed-quality study sampled generic Poncirus trifoliata, Sunki mandarin and five citrandarins from an IAC clonal garden in Cordeirópolis. The abstract reports seed germination remained above 50% through 12 months of storage for the tested rootstock materials; storage was at 5±2°C and 85±5% relative humidity. This is propagation evidence for the studied material, not evidence about the Rubidoux selection. Table measurements are omitted because visual verification was unavailable.
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Citrusgrowersv2 ProBoards
Reviewed from the user-supplied HTML capture; the live thread was not independently retrieved. In post #4924 (Nov. 28, 2020), till reports Poncirus juice left overnight in an open glass; he says the pine flavor disappeared and resin settled, producing a lemonade he liked. This is a personal processing and tasting report, not evidence for the chemical explanation proposed later in the post.
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W. P. Bitters · California Agriculture · 1952
Vol. 6, no. 11 (1952), pp. 5–6. Historical Riverside report of rootstock/scion trials involving trifoliate orange and citrus hybrids; exocortis observations are specific to the reported scion/rootstock combinations and do not establish a species-wide susceptibility.
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Skandiberg · Tropical Fruit Forum · 2025-11-19
https://www.tropicalfruitforum.com/index.php?topic=60062.msg570919#msg570919 (opens in a new tab)
In a shipment of received fruit, Skandiberg reports one unspecified Poncirus trifoliata fruit labelled “Random PT,” at 14 °Bx, with dozens of seeds and a sticky, resinous rind that was darker than those of the named comparison selections. The sample was said to come from a Mediterranean area, but orchard, selection identity and growing conditions are unknown. Subjective sweet/sour impressions are not used as a score or variety-wide claim.
Accessed
kumin · Tropical Fruit Forum · Cold Hardy Citrus · 2019-08-27
https://www.tropicalfruitforum.com/index.php?topic=30891.msg363766#msg363766 (opens in a new tab)
In adjacent posts #363757 and #363766, Kumin reports that January low temperatures did not affect fruitfulness on his Poncirus tree, which was full of fruit as usual. Responding to a question about ripening, he says the same tree had been shown the previous year and that its fruit ripens every year, but not before October. The report gives no numerical winter minimum, locality, sample count, or verified selection/accession identity.
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