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World of CitrusWorld of CitrusYuzuquat
J. Stewart Nagle · Fruit Gardener · December 1993
https://www.scribd.com/doc/138564018/New-Noteworthy-Citrus-From-Texas (opens in a new tab)
Nagle reports that Yuzuquat is a Nameiwa (Nagami × Meiwa Kumquat) × Yuzu cross made by William B. Chapman in the late 1960s and grafted onto trifoliate orange at Dr. Brown’s, where the original tree was reported to remain. The p. 28 continuation describes large, lemon-sized yellow pyriform fruit with sour, juicy flesh and aromatic edible peel; the source also reports abundant seed and polyembryony. It describes an upright, productive, nearly thornless tree, suggests a mature form around 15 ft by 8 ft, notes recurring flowering after substantial summer rain, and recounts survival through severe freezes including more than 100 hours below freezing and single-digit °F minima. These are historical reports; the account gives no precise freeze-event minimum, instrumentation, or protection details, so they are not a guaranteed hardiness threshold.
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Hardy Citrus blog · 2013-12-23
https://hardycitrus.blogspot.com/2013/12/yuzuquat.html (opens in a new tab)
This post explicitly cites J. Stewart Nagle’s December 1993 article, p. 15, and repeats its reported Nameiwa (Nagami × Meiwa) × Yuzu cross, late-1960s William B. Chapman attribution and severe-freeze account. It is a secondary retelling, not a firsthand report or independent confirmation. The post also describes fruit as large kumquat size, tending sour with little bitterness or sweetness, with April fruit set ripening by late August and remaining on the tree for several months; sample location and maturity are unspecified.
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nullroar, manfromyard, PDXIan, and other forum participants · The Tropical Fruit Forum · 2021-11-03
https://www.tropicalfruitforum.com/index.php?topic=45576.0 (opens in a new tab)
In this one-page thread, manfromyard reports a Yuzuquat seedling with one fruit in 2021 and later describes having fruit once as small, lemonish and sour, never sweet, from an extremely thorny plant (reply #8, November 24, 2022). In #12 he adds that Yuzu flavor is more evident in peel than juice; this is the same grower, not a second sample. In #13 PDXIan reports a plant from cuttings received from manfromyard blooming in 2024, without a fruit result. The thread also relays a possible nursery reintroduction (#6) and a recollection that Southeast warmth did not suit the plant (#14), neither establishing availability or a measured heat/cold response. The forum posts do not connect these plants to Chapman’s historical selection. Do not assume this manfromyard is the Growing Fruit poster with the same handle.
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manfromyard · Growing Fruit forum · 2022-01-23
https://growingfruit.org/t/can-fruit-be-grown-in-the-pacific-northwest/29282/20 (opens in a new tab)
In post #20, the author reports removing his Yuzuquat because its fruit was sour with no flavor and the plant grew fast with excessive thorns. This is a firsthand opinion about one plant, but the post does not state its parentage, source, growing site, rootstock, fruit maturity or sample size. Do not assume this manfromyard is the same person as the identically named Tropical Fruit Forum participant.
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mrtexas · Citrus Growers Forum · 2011-04-21
http://citrusgrowersstatic.chez.com/web/viewtopic7653.php (opens in a new tab)
In the April 21, 2011 reply, mrtexas (profile location Missouri City, Texas, zone 9a) calls Yuzuquat sour without much flavor. This is a direct grower opinion, but the post gives no specimen, fruit maturity, source, rootstock, or temperature context; it does not establish identity with later forum reports.
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https://www.youtube.com/watch?v=hAvO8Wtjgq0 (opens in a new tab)
Summary from transcript: The presenter says the fruit likely came from Derek’s personal tree but qualifies that identification, and says he does not know which kumquat parent was used. He describes the fruit as a Yuzu–kumquat hybrid, with two refrigerated fruits weighing 60 g and 62 g (spoken mean 61 g); he primarily tastes the firmer fruit, while the softer fruit is not his main tasting specimen. His aroma, peel, flesh and flavor comments are subjective observations from this tasting. His cold-hardiness comments are hearsay and tentative comparisons, not a measured cold-survival report.
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alexFortJames
https://www.youtube.com/watch?v=9svDsdGto98 (opens in a new tab)
Summary from transcript: The presenter says he tasted Yuzuquat at a Tom McClendon citrus tasting and obtained several fruits and seeds; he is reviewing one fruit. He identifies it as a Yuzu × kumquat hybrid and says he has heard Nameiwa may be the kumquat parent, but does not know whether that is true. He describes this fruit as about the size of a large egg, more oblong than Yuzu, with an easy soft peel, juicy lemon-like flesh and Yuzu notes. His estimate of possible cold tolerance around 10–12 °F for a few hours or nights is speculative comparison, not an observed exposure. He gives no fruit weight, Brix or pH.
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https://themulberries.org/wp-content/uploads/2026/01/Yuzuquat.png (opens in a new tab)
The visually checked scorecard is the companion card for the Yuzuquat tasting in The Mulberries’ video, not a second tasting. It lists 60 g, 13.5 °Bx and pH 2.9; its 8.5 sweetness/Brix row combines separate spoken subscores (sweetness 3.5/5 and Brix 5/5), so 8.5 is not a standalone sweetness score. The card’s sourness/pH row is also composite and is not converted to a sourness score. The separate 8/10 low-bitterness rating converts to 2/10 on the catalog’s reversed bitterness scale. The card and video differ in how they report the sample weight.
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Gregn · UBC Botanical Garden Forums · 2006-07-09
In a July 9, 2006 post in a thread started October 15, 2005, Gregn says Yuzuquat was among several plants doing best for him under poly. He describes new growth and some second blooms but does not identify which plants were in ground or pots, and gives no plant age, source, rootstock or measured cold conditions.
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