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World of CitrusWorld of CitrusRuby Red Grapefruit
United States plant patent · Google Patents
https://patents.google.com/patent/USPP53P/en (opens in a new tab)
Patent metadata checked September 19, 2026; reported status and expiration are not a legal determination.
Accessed
J.V. da Graça, E.S. Louzada, and J.W. Sauls · Proceedings of the International Society of Citriculture · 2004
The paper reports Ruby Red as a Thompson Pink bud sport found in 1929, first called Henninger Ruby Red, and later named Ruby Red; it gives 1934 for patenting (p. 369), differing from the catalog summary's 1933. Preserve the dated-source conflict.
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Pittman & Davis · Pittman & Davis · 2012-12-17
https://blog2.pittmandavis.com/the-origins-of-ruby-red-grapefruit/ (opens in a new tab)
Retailer popular-history article; unsourced retrospective. It describes a 1929 red-fleshed grapefruit mutation as discovered in a small orchard and claims the newly named Ruby Red gave rise to the Texas grapefruit industry within five years. The article does not identify the orchard, discoverer, parent tree, or the industry milestone meant by that interval; do not use its comparative-sweetness wording as a fruit taste score.
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Real Life Fruitopia · YouTube · 2022-02-07
https://www.youtube.com/watch?v=MD_5m3HgdYg (opens in a new tab)
Summary from transcript: English auto-generated captions from a 2022 video about one home-grown Ruby Red tree and one fruit tasting. The speaker estimates one season's backyard crop at 40–50 fruit and the next at about 20; these are informal estimates, not trial yields. The tasted fruit is described as juicy and tangy, with much pith and a strong citrus taste; no numerical taste score or lab measurement is reported.
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Byron Martin · YouTube — LogeesPlants
https://www.youtube.com/watch?v=5d3Ty1kuRnQ (opens in a new tab)
Summary from transcript: LogeesPlants presenter Byron Martin identifies the cultivar as Ruby Red. At 0:02–0:25 he describes a December off year for the greenhouse citrus; at 0:25–0:47 he shows a large cluster on the mother tree and says the fruit are fairly large because the tree carries very little fruit, calling the cluster a chance occurrence. No crop count or fruit dimensions are reported. The page showed a relative age, not an exact publication date.
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Graham H. Barry et al. · The Genus Citrus (ScienceDirect Topics excerpt) · 2020
The chapter reports Henninger’s Ruby Red as a 1929 Texas mutation of Thompson and calls it the first U.S.-patented citrus variety, giving 1934. This conflicts with the catalog’s primary-patent record for U.S. Plant Patent 53 (granted January 24, 1933); the chapter does not resolve that date difference.
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Nagendra Pratap Singh; Mamoudou Sétamou; Madhurababu Kunta; Venugopal Mendu · Scientific Reports (Nature Portfolio)
https://www.nature.com/articles/s41598-026-72986-x_reference.pdf (opens in a new tab)
Article in Press (DOI 10.1038/s41598-026-72986-x); no publication date supplied in the PDF. Table 1 gives the comparative Ruby Red profile as pink-red flesh, moderate naringin, and color fading after January. These are source-attributed cultivar descriptions, not measurements from a Ruby Red fruit sample or a reported naringin assay. The study sequences young leaves from field-grown Rio Red, Ruby Red and Texas Red TR-1 in Weslaco and compares complete chloroplast genomes; the plastome comparison does not establish nuclear parentage.
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desertgardengirl · Growing Fruit · 2016-11-09
https://growingfruit.org/t/flame-grapefruit-tree-anyone-have-one/7735/11 (opens in a new tab)
Post 11 in Growing Fruit forum topic 7735, “Flame grapefruit tree, anyone have one?” The Arizona grower describes her former Ruby Red grapefruit tree as a very good producer over four years. Her comparison with her current Flame is reported separately and is not treated as a Ruby Red taste rating. This post does not identify the previous tree’s location, rootstock, or annual crop size.
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