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World of CitrusWorld of CitrusBitters C-22 Citrandarin
University of California, Riverside — Citrus Variety Collection
https://citrusvariety.ucr.edu/crc4219 (opens in a new tab)
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Givaudan Citrus Variety Collection at UCR
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The Mulberries · YouTube · December 30, 2025
https://www.youtube.com/watch?v=XDvO6aB8ekM (opens in a new tab)
Summary from transcript: One reviewer tested supplied C-22 fruit received in late November or early December in North Carolina and considered it likely not fully ripe. Measurements and sensory descriptions are retained separately for this cultivar.
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West Coast Agroforestry
Secondary plant profile. Its compiled disease table is unmethoded; its quoted grower comparison of C-22 fruit as mushy is a limited grower report, not a controlled trial.
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Louzada ES; del Rio HS; Setamou M; Watson JW; Swietlik DM · Euphytica · 2008
https://doi.org/10.1007/s10681-008-9701-x (opens in a new tab)
Full abstract and figure captions were recovered through the supplied ResearchGate record; the full paper was unavailable. The Rio Red grapefruit scion trial compared ten rootstocks for six years in South Texas calcareous high-pH soil. It does not evaluate own-rootstock fruit taste.
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Rcarlyle · Reddit
A discussion of C-22 seedlings. One direct reply describes uni-, bi-, and trifoliate leaf variation, later trifoliate leaves, and an unverified nucellar-identity hypothesis with unknown ratio. It does not report rootstock yield trials.
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Claire T. Federici; Ricarda S. Kupper; Mikeal L. Roose · University of California, Riverside · 2009
Primary UCR handout. Page 1 states that Bitters C-22, Carpenter C-54, and Furr C-57 were released by UC Riverside in August 2009; that the selections were produced by the USDA program at Indio and selected and tested at UC Riverside; and that CCPP buds would be available in September 2009.
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Niles RK; Freckman DW; Roose ML · Plant Disease · August 1995
Primary article. The study included a greenhouse screen of 21 rootstocks against a tested Tylenchulus semipenetrans population: 15 plants per rootstock in the pot experiment and five per rootstock in the cone experiment. C-22 was included, but the article does not report the heightened resistance described for C-54 and C-57. This is not a field trial.
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The Mulberries
https://themulberries.org/cold-hardy-citrus-taste-tests/ (opens in a new tab)
Scorecard page with separate C-57, C-54, and C-22 assets. Original card labels are used to clarify categorical taste fields for the same sampled fruit documented in the associated video; numeric score directions are not mapped directly to categories.
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Glenn C. Wright; Stephen Poe · Arizona Department of Agriculture
https://agriculture.az.gov/sites/default/files/documents/Final%2016-02.pdf (opens in a new tab)
Five-page report covering January 2016–June 2017. Page 2 reports Corona Foothills lemon scions planted June 15, 2017. Page 5 reports only initial height and scion/rootstock diameters; it does not report yield, fruit quality, disease, or trial-performance outcomes.
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