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Topics - a_Vivaldi

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1
Citrus Buy, Sell, & Trade / For sale: Fresh Dunstan Citrumelo Seeds
« on: November 14, 2025, 08:12:45 PM »
Hi all,

I've a decent quantity of Dunstan Citrumelo seed available from fruit I picked this week. I expect about one or two hundred seeds in total.

Free shipping, 50¢ per seed, minimum of $10. PM me.

Seeds will be shipped straight after cleaning and packaged in a slightly moist paper towels, sealed in a plastic bag, and wrapped in bubble wrap, they should arrive undamaged and fully viable. Paper towels will be treated with a very dilute bleach solution to prevent mold.

Sorry, no shipping to California, Florida, or Texas as my understanding is it's illegal.

Dunstan is a large, fairly vigorous tree, a trifoliate x white grapefruit cross. Seedlings are hardy to lower teens, established trees are hardy to around 0 F. Fruit are the size of medium grapefruit, ripen later Oct-Nov in NC, moderately seedy for a hybrid, and have a grapefruit/lemon flavor with some orange and trifoliate notes. Somewhat tart to sweet-tart depending on ripeness. Very juicy. IMHO a top five trifoliate hybrid.

2
Cold Hardy Citrus / US-852 seedlings in Greenville NC
« on: August 13, 2025, 10:36:42 PM »
I was trying to find a good thread to put this under but none of the existing US-852 threads seemed appropriate so I'll just start a new one.

I have some very interesting changes on some US-852 seedlings I planted a year and a half ago.

Initially, both were highly dwarfed and had really strange looking trifoliate leaves. One was tiny and very dense, the other one had whispy, long, thin leaves.

The whispy one is growing slowly still and has proven a favorite of the grasshoppers unfortunately.



Now the dense one is suddenly after a year of almost no growth sending up two water sprouts–with monofoliate leaves! Usually it’s the other way around where slow growth is monofoliate and fast growth is trifoliate. I'm honestly a bit confused by this plant. Will it revert to dense trifoliate growth when it slows down again? Did I get a really weird bud mutation?







If I get time I’ll graft some material from these up on some vigorous rootstock to hopefully get them going a little faster. It’s somewhat late in the year to be grafting through as new grafts tend to be winter tender.

Additionally, I tasted the leaves to see if they had much bitterness or skunky flavors or whatnot and... they're mostly tasteless. Which is also weird. The only other really mild tasting citrus leaves I've had were from the JC Raulston Ichang Papeda. I'm thinking it might just be because the plant, while pretty old, is still very much a juvenile seedling. I'll keep an eye on it. I meant to taste the whispy seedling but haven't yet.

There's a third off type seedling from the same batch but it has mostly normal leaves. It's just painfully slow growing and very nearly died this spring. I might cull it if it doesn't do anything interesting. A fourth one is almost completely normal except for shorter then normal internodes. All the other seedlings from that batch were most likely nucellar and are just normal US-852.

The weird seedlings survived temperatures in the teens this past winter, which is nothing special for US-852. Both suffered some dieback but they were also both sickly little things in small pots so it's good they survived at all.

3
Cold Hardy Citrus / Clementine x Thomasville 2024 in Greenville NC
« on: July 23, 2025, 09:59:49 AM »
Last year I made a handful of hand pollinations of an unknown variety of clementine with Thomasville citrangequat pollen. The resulting fruits ripened in November and yielded a bit less than a hundred seed. Now that the seedlings have had time to differentiate in terms of form, vigor, and health, I've decided I might as well share the progress so far.


One of the fruits.


Seed from that fruit. Ordinarily clementines are seedless as they are self-incompatible, but when pollenated they can be fairly seedy.

4
Tropical Fruit Buy, Sell & Trade / Sulfan/oryzalin source
« on: May 27, 2025, 12:59:59 PM »
This isn't quite the right topic since it's not about plants themselves but I want sure where else to put this post.

It looks like oryzalin, brand name Surflan, is mostly unavailable in the US now. A lot of online stores still list it, but they are all out of stock. A few articles I found mentioned that the manufacturer stopped producing it after some kind of damage to their site, but there were no details beyond that and it was unclear if the product is officially discontinued or not.

Does anyone still have some or know of a source that still has it?

5
Tropical Fruit Buy, Sell & Trade / WTB: Elaeagnus latifolia
« on: May 05, 2025, 10:28:01 AM »
I would like to buy plant or seed of Elaeagnus latifolia.

6
Tropical Fruit Buy, Sell & Trade / WTB: Passiflora tucumanensis
« on: May 05, 2025, 10:26:20 AM »
I am looking to buy either seed or plants of Passiflora tucumanensis or hybrids thereof.

7
Citrus General Discussion / All those new Madison Citrus varieties
« on: March 06, 2025, 08:45:13 PM »
Madison Citrus Nursery just announced the variety names of the nearly 300 new citruses they will be adding in the coming months. I'm sure many of them will end up getting their own discussions but I wanted to start with a topic covering them all just generally.

Allen-Utt Eureka Lemon
Allen Eureka Lemon
Aoshima Satsuma
Algerian Clementine
Alemow
Ain Taoujdate Clementine
African Shaddock X Rubidoux Trifoliate
Abers Sour Orange
Burgundy Grapefruit
Brown Marsh Grapefruit
Bream Tarocco Blood Orange
Bower Mandarin
Bouquetier De Nice Sour Orange
Bouquet De Fleurs Sour Orange
Borneo Rangpur Lime
Bitters C-22 Citrange
Bigaradier Apepu Abers Sour Orange
Bidwells Bar Sweet Orange
Benton Citrange
Banpeiyu Pummelo
Bangladesh Lemon
Bahianinha SRA 513 Navel
Bahianinha Araras Navel
Avana Tardivo Di Ciaculli Mandarin
Avana Apireno Mandarin
Autumn Gold Navel
Atwood Navel
Arrufatina Clementine
China 6-22 Satsuma
Chapman Valencia
Cayman Ugli Tangelo
Carvalhal 3-3-37
Carter Navel
Carte Noir Clementine
Carpenter C-54 Citrange
Campbell Old Line Valencia
Campbell Nucellar Valencia
Cambria Navel
Caffin Clementine
Cadenera Sweet Orange
C-35 Citrange
C-32 Citrange
C-190 Citrumelo
C-146 Citrange
C Tachibana US 1-67
C Neoaurantium DPI-50-46
C Moi F-11-8W
C Macrophylla DPI-226
Cunningham Citrange
Cuban Shaddock
Crisafulli Navel
Corsica #2 Clementine
Corsica #1 Clementine
Cogan Navel
Cleopatra Mandarin
Clemenules "Nules" Clementine
Clementine X Pearl Mandarin
Clementard Clementine - IVIA 65
Clemelin Tangor
Clausellina Satsuma
Citrus Sunki
Citrumelo (CRC 3341)
Citrumelo (CRC 1452)
Citrum F-W-4
Citrum F-80-8
Citrange C-35
Cipo Sweet Orange
Chironja Grapefruit
Fisher Navel
Finger Lime UF KB-38
Fina Sodea Clementine
Fina Clementine
Fertic Te DPI-216
Fallglo US
Everhard Navel
Enterprise 609-14-17
Encore Mandarin
Emerald Mandarin
Ellendale Tangor
Eddy Navel
Dweet Tangor
Dom Joao Valencia
Dobla Fina Blood Orange
Diller Sweet Orange
Dickinson Gold Valencia
Delta Valencia
Daisy Mandarin
Cutter Nucellar Valencia
Hickson Mandarin
Hesperethusa UF
Hernandina Clementine
Henderson Ruby Grapefruit
Hawaiian Pink Shaddock
Hass Pink Navel
Harward Late Valencia
Hansen Mandarin
Gillette Navel
Gillets UF
Gillemberg Navel
Gardner US 6-16
Furr C-57 Citrange
Frost Marsh Grapefruit
Frost Eureka Lemon
Fronton Sweet Orange
Fremont Mandarin
Fraser Seville Sour Orange
Foster Grapefruit
Fortune Mandarin
Kao Phuang Pummelo
Kao Pan Pummelo
Kao Nun Pummelo
K X R UF
Joes Early CGIP-238
Jincheng Sweet Orange
Jaffa
Jackson Grapefruit
Iyo Mikan Tangor
Iwasaki Satsuma
Iveriya Satsuma
Itaborai UF 31-6
Isle O Pine Grapefruit
Imperial Mandarin
Imperial Grapefruit
Hyuganatsu US 12-43
Hudson Grapefruit
Honey Mandarin
Homosassa 56-10-28
Hiryu Flying Dragon
Mary Ellen Sweet Lime
Marisol Clementine
Malayan Kumquat UF
Madam Vinous Sweet Orange
Limoneira 8A Lisbon Lemon
Lima Acidless Sweet Orange
Leng Navel
Lee Mandarin
Leanri Mandarin
Lane Late Navel
Koster Tangor
Kiyomi Tangor
Kirkwood Red Navel
Kinokuni US 11-65
Kinnow Mandarin
Kinnow Mandarin LS
Kinkoju Unshiu Mandarin Hybrid
Kiella Calusa Abers Sour Orange
Khalily US 2-29
Kara Mandarin
Navelo 81-16-15
Navelina Navel
Navel Grapefruit
Naugle Lemon
Natsumikan
Nansho Daidai
Nakon Pummelo
Myrtifolia Sour Orange
Murcott Mandarin
Mott Grapefruit
Morton US 1-3
Monreal Clementine
Miyamoto Satsuma
Milam UF A
Midsweet US 6-9
Microcitrus Papuana
Michal Mandarin
Mediterranean Swt F-58-38
McCarty Grapefruit
Mayaca Navel
Parana Grapefruit
Pandan Wangi Pummelo
Palmer Navel
P Tri Wacissa F-18-1
Osceola US 3-58
Ortanique Tangor
Oroval Clementine
Orange A Feuilles Laciniees Sweet Orange
Olinda Nucellar Valencia (MCEWEN)
Olinda Nucellar Valencia
Old Line Eureka Lemon
Novelty X Ellendale Mandarin
Nova Mandarin
Nova Mandarin LS
Nour Clementine
Nour CGIP-149
Norton SPB-306
Nichinan Ichigo Satsuma
Newhall Navel
Nepolitana Satsuma
Rico 5-50 Sweet Orange
Richards Special Mandarin
Rex Union Grapefruit
Reinking Pummelo
Reed Marsh Grapefruit
Redblush Grapefruit
Red Java Pummelo
Ray Ruby Grapefruit
Queen 25-2-15
Primasol Mandarin
Pope F-53-28
Pomeroy Trifoliate
Persian Lime SPB-7
Perry Heritage Sweet Orange
Pera 3-3-85
Pehrson #4 Valencia
Pehrson #3 Valencia
Pearl Tangelo
Parsons Brown
Parson Special US
Setoka
Seminole SPB-342-3-3
Selma Satsuma
Sarawak Pummelo
Santa Cat Navel US 1
Santa Barbara Tangelo
Sampson UF 9-1A
Salustiana Sweet Orange
Ryan Navel
Rusk Citrange
Rotuma Island Sweet Orange
Rocky Hill Valencia
Rocky Hill Navel
Robinson US 3-56
Robertson Old Line Navel
Robertson Navel
Rio Grande Navel
Rio Farms Vaniglia Sweet Orange
Ridge PI SPB-602-36
Rico 7-56 Sweet Orange
Sundiatgo US
Sun Hing Pummelo
Sun Chu Sha US
Sun Chu Sha Kat Mandarin
Summerfield Navel
Summer Gold Navel
Sue Linda Temple
Standard Sour Orange
SRA 92 Clementine
SRA 63 Clementine
Soh Himtra Mandarin
Small Leaf Trifoliate
Skaggs Bonanza Navel
Sidi Aissa Clementine
Siamese Sweet Pummelo
Shatian Pummelo
Shasta Gold Mandarin
Shamouti Sweet Orange
Shambar Grapefruit
Sexton
US Furr
Troyer Citrange
Triumph Grapefruit
Trifoliate X Ruby Orange
Trifoliate #22
Trifeola
Tieu Mandarin
Thong Dee Pummelo
Thompson Grapefruit
Thermal Tarocco Blood Orange
Temple X Minneola Tangor
Taylor Eureka Lemon
Tahoe Gold Mandarin
T.J. Zimmerman Navel
T.I. Sheldon Navel
T.I. Rush Navel
Sydney Hybrid US
Swingle
Sunstar US
Sunshine US
Riverside 1873S Parent Washington Navel
Ruby Swt (35) UF
Rojo Blanco Pummelo Hybrid
Yosemite Gold Mandarin
Yen Ben Lisbon Lemon
Xuegan Sweet Orange
Winters Seedless Eureka Lemon
Wilking Mandarin
Wekiwa Tangelo
Washington Sanguine Blood Orange
W. Murcott Afourer Mandarin
Valencia Late
US-897
US-852 Citrandarin
US-1282
US-1281
US-1279
US Seedless Surprise
US Ortanique LS
US Furr ST

8
Cold Hardy Citrus / Hong Kong kumquat
« on: January 18, 2025, 04:40:32 PM »
I'm going to create a dedicated topic for this one since it's been mentioned a few times in other posts.

I had four seeds recently germinate and can confirm that it's generally monoembryonic but of those four one was polyembryonic.

9
Citrus General Discussion / Clementine cold tolerance?
« on: August 28, 2024, 01:05:24 PM »
Out of curiosity, does anyone here have much experience with the cold tolerance of clementines?

10
Cold Hardy Citrus / Poorman Orange/New Zealand Grapefruit
« on: February 08, 2024, 10:46:47 AM »
I've read that this particular citrus is common in NZ due to its low heat requirement compared to true grapefruits, itself being some kind of pomelo x either a mandarin, a sour orange, or a tangelo (gee, that narrows it down a bit...).

What I can't seem to find any information on is how cold tolerant this thing is. I found plenty of info on NZ Lemonade, a different citrus, but nothing about NZ Grapefruit. Anyone have an idea?

11
Cold Hardy Citrus / Heterozygosity and zygotic breeding lines
« on: January 17, 2024, 10:47:38 AM »
While I am nowhere near up to speed on all the literature, most of what I have read indicates that, at least for polyembryony, which associates closely with nucellar seed and is a major practical hindrance for breeding, is controlled by a single dominant gene, with a variety of genetic and non genetic factors affecting the degree of polyembryony. What I am wondering is if most polyembryonic varieties are heterozygous, carrying a copy of the recessive allele for monoembryony and thus zygotic seedlings, or if the years of selecting zygotic seedlings from large populations of nucellar seedlings bred from two polyembryonic parents has lead to many if not most polyembryonic citrus to being homozygous for that darned gene.

Some are easy enough to know, since we have many varieties that are F1 children of pomelos, citrons, etc. But for other varieties, say satsumas or the various citromelos with grapefruit parentage, do we know if they tend to be heterozygous?

The practical side to all of this comes down to how many generations are needed and if any back crossing to the zygotic parent is required to eliminate polyembryonism.

12
Cold Hardy Citrus / Table of citrus cold hardiness and %zygotic seed
« on: May 25, 2023, 04:56:15 PM »
Note: %zygotic and hardiness values are not absolute. Zygotic and nucellar seedlings are strongly influenced by the pollen donor and may be influenced by environmental variables as well. Hardiness is even more variable. Hardiness is affected by factors such as duration of the cold event, rootstock, humidity, windspeed, exposure, solar radiation, etc. Winter hardiness is also highly dependent on full dormancy and properly hardened off plant material. Periods of warmth preceding a freeze can drastically reduce cold hardiness, and less mature plant material is considerably more susceptible to damage. Lastly, the values below assume mature plants, juvenile or otherwise small plants are not as hardy. For climates, as a rule of thumb, plants the southeast USA are more prone to not being fully dormant, but freezes are generally short duration, often only a few hours, so the absolute lows that plants will survive may be several degrees colder than in other climates, whereas plants in the pacific northwest and in Europe are more likely to be properly dormant, but cold events generally last longer and night to day temperatures might not be much different. In both climates, plants can easily be killed by temperatures above their technical cold hardiness limit, in the southeast this is often due to plants not fully entering or having broken dormancy prior to a freeze, and in the PNW and Europe due to freezing temperatures lasting for extended periods of time (pretty much any edible citrus plants will be damaged or killed  by four or five days continuously below 30 F, or by three weeks of sunny 70 F weather followed by a night of 30 F).

   Variety      % zygotic    Cold hardiness      Parentage    source(s)    
   1584      10-20                     
   5*      Low?      5 10 F               
   54-1-2      High      Similar to Satsumas            Screening Citrus Hybrids for Cold Hardiness, Youg and Hearn, USDA 1972   
   African Shaddock x Poncitrus      Low                     
   Benton Citrange      2                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Bishop Citrandarin      High?      5 F      US-852         
   C-146      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   C-22 bitters      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   C-35      10-20      Less hardy than other citranges            https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   C-54 Carpenter      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   C-57 Furr      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Calamandarin            15 F            https://tropicalfruitforum.com/index.php?topic=19167.0   
   Calamondin      Low                  http://citruspages.free.fr/classification.php#embryony   
   Carrizo      0-10            Citrus sinensis × Poncirus trifoliata      https://citrusrootstocks.org/   
   Changsha      Low      6 - 10 F      c. reticulata      http://www.mckenzie-farms.com/photo.htm, http://citrusgrowersstatic.chez.com/web/viewtopic843e.php, Screening Citrus Hybrids for Cold Hardiness, Youg and Hearn, USDA 1972   
   CiClem 10            10 F               
   Citron      100      Upper twenties at best            http://citruspages.free.fr/classification.php#embryony   
   citrus glauca      100      15 - 20 F               
   Citrus maxima      100      25 F               
   Clementine      100      20 F               
   Clem-Yuz 2-2            8 - 10 F               
   ClemYuz 3-3            10 - 12 F      Clementine x Yuzu         
   Cleopatra mandarin      0-1            C. reticulata      https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Dancy Mandarin      Low      20 - 25 F            Screening Citrus Hybrids for Cold Hardiness, Youg and Hearn, USDA 1972   
   Dimicelli      Low      5 - 10 F               
   Dunstan      Low      0F?      trifoliata × paradisi       https://jcra.ncsu.edu/horticulture/our-plants/results-by-name-serial-number.php?serial=117972   
   Ellendale      100      20 F               
   Eremolemon      Low      13 - 20 F      c. glauca x Meyer or c. glauca x paradisii      http://hardycitrus.blogspot.com/2014/01/cold-hardiness-table_13.html   
   Flying dragon      10 - 50      -15 F -5F             https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Freemont      37            c. reticulata      https://www.researchgate.net/publication/285650439_Identification_of_Zygotic_and_Nucellar_Individuals_Produced_from_Several_Citrus_Crosses_Using_SSRs_Markers/fulltext/57bd7a8e08ae37ee394b9c20/Identification-of-Zygotic-and-Nucellar-Individuals-Produced-from-Several-Citrus-Crosses-Using-SSRs-Markers.pdf   
   Glen citrangedin            10 F               
   Goutou      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Ichange lemon      Low      15 - 20 F            http://www.mckenzie-farms.com/photo.htm   
   Ichange Papeda      100      0 - 5 F      c. ichangensis         
   Ichangquat 6-7-2      100      5 F               
   Imperial      90            c. reticulata      https://www.publish.csiro.au/an/EA9960731   
   Juanita Tangerine            10 F            https://tropicalfruitforum.com/index.php?topic=19167.0   
   Keraji      High?      6 - 15 F      c. reticulata      http://citrusgrowersstatic.chez.com/web/viewtopice38a.php, http://citrusgrowersstatic.chez.com/web/viewtopic843e.php   
   Kinkoji      14      15 F      C. reticulata      https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html, http://www.mckenzie-farms.com/photo.htm   
   Kishu      Low      25-32 F      c. reticulata      https://madisoncitrusnursery.com, http://citruspages.free.fr/classification.php#monotypes, http://citruspages.free.fr/classification.php#embryony   
   Kuharske      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Meiwa Kumquat      Low      10 - 15 F      c. japonica         
   Meyer Lemon      100      18 - 22 F      c. limonia x c reticulata      http://www.agrumes-passion.com/viewtopic.php?f=52&t=301&start=   
   Miyagawa      Low            c. reticulata      https://www.researchgate.net/publication/285650439_Identification_of_Zygotic_and_Nucellar_Individuals_Produced_from_Several_Citrus_Crosses_Using_SSRs_Markers/fulltext/57bd7a8e08ae37ee394b9c20/Identification-of-Zygotic-and-Nucellar-Individuals-Produced-from-Several-Citrus-Crosses-Using-SSRs-Markers.pdf   
   Morton Citrange      Low      5 F            https://hardycitrus.blogspot.com/2013/12/morton-citrange.html   
   Nagami Kumquat      High            c. japonica         
   Nansho Daidai      30      5 - 10 F      c. taiwanica      https://hardycitrus.blogspot.com   
   New Zealand Grapefruit/Poorman orange      100                     
   New Zealand Lemonaid            16 F               
   Nippon Orangequat      Low      10-12 F      Meiwa kumquat x satsuma         
   Owari and similar satsumas      Low      12-15 F      c. reticulata      http://www.mckenzie-farms.com/photo.htm   
   Palestine lime      Low                  http://citruspages.free.fr/classification.php#embryony   
   Prague Citsuma      NA      1 F            https://hardycitrus.blogspot.com/2020/02/prague-citsuma.html   
   Procimequat      Low                     
   Rangpur lime      Low      15-20 F      c. limonia x c reticulata      http://citruspages.free.fr/classification.php#embryony   
   Robinson      31      20 - 25 F      c. reticulata      https://www.researchgate.net/publication/285650439_Identification_of_Zygotic_and_Nucellar_Individuals_Produced_from_Several_Citrus_Crosses_Using_SSRs_Markers/fulltext/57bd7a8e08ae37ee394b9c20/Identification-of-Zygotic-and-Nucellar-Individuals-Produced-from-Several-Citrus-Crosses-Using-SSRs-Markers.pdf, Screening Citrus Hybrids for Cold Hardiness, Youg and Hearn, USDA 1972   
   Rough lemon      10-20      Mid to upper twenties            https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Rusk citrange      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Sacaton Citrumelo      50                     
   SanCitChange #10 Roundleaf            10?      Changsha x Sanford citrange      https://tropicalfruitforum.com/index.php?topic=19167.0   
   Sandford Curafora      Moderate      10 - 17 F      F2 Sandford Citrange         
   Seville sour orange      Low      12-15 F      c. aurantium      https://tropicalfruitforum.com/index.php?topic=19167.0   
   Shekwasha mandarin      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Smooth Flat Seville      59      15 F      c. aurantium      https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Sudachi      Low      15 F            https://madisoncitrusnursery.com   
   Sun Chu Sha mandarin      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Sunquat            15 F      Meiwa kumquat x clementine         
   Sweet Oranges      Low      20 - 25            http://citruspages.free.fr/classification.php#embryony   
   Swingle      10-20      10 F      Citrus paradisi × P. trifoliata      https://citrusrootstocks.org/rootstock-cultivars/   
   Taitri            0 - 5 F      c. taiwanica x p. trifoliata      http://hardycitrus.blogspot.com/2014/01/cold-hardiness-table_13.html   
   Temple Tangor      100      Upper twenties at best               
   Thomasville      Low      5 - 10 F      Willits citrange x nagami kumquat         
   Thomasville citrangequant      Low      5 - 10 F            http://www.mckenzie-farms.com/photo.htm   
   Trifoliate orange      10-20      -15 F            https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   True grapefruits      0      20-25 F            http://citruspages.free.fr/classification.php#embryony   
   True lemons      0      Upper twenties at best            http://citruspages.free.fr/classification.php#embryony   
   True limes      0      Upper twenties at best            http://citruspages.free.fr/classification.php#embryony   
   UFR-1      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-15      50-90                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-16      50-90                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-17      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-2      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-4      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-5      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   UFR-6      10-20            Citrus reticulata ‘Changsha’ × P. trifoliata ‘English Large’      https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html, https://www.houzz.com/discussions/5002069/us-852-hardy-citrandarin   
   Ugli      100      Upper twenties at best               
   Umatillo      High      Upper twenties at best            Screening Citrus Hybrids for Cold Hardiness, Youg and Hearn, USDA 1972   
   US SuperSour1      100            C. grandis ‘Hirado Buntan sdlg’ × C. reticulata ‘Cleopatra’      https://citrusrootstocks.org/   
   US SuperSour2      100            P. trifoliata × (Citrus aurantium × Citrus ichangensis)      https://citrusrootstocks.org/rootstock-cultivars/   
   US-119            15 F      (Poncirus trifoliate x Citrus paradisi)xCitrus sinensis         
   US-1279      100      More hardy than US-1281      C. reticulata ‘Changsha’ × P. trifoliata ‘Gotha Road’      https://citrusrootstocks.org/rootstock-cultivars/, https://tropicalfruitforum.com/index.php?topic=30891.475   
   US-1281      100            C. reticulata ‘Cleopatra’ × P. trifoliata ‘Gotha Road’      https://citrusrootstocks.org/rootstock-cultivars/   
   US-1282      100      Less hardy than US-1281      C. reticulata ‘Cleopatra’ × P. trifoliata ‘Gotha Road’      https://citrusrootstocks.org/rootstock-cultivars/, https://tropicalfruitforum.com/index.php?topic=30891.475   
   US-1283      0-10            C. reticulata ‘Ninkat’ × P. trifoliata ‘Gotha Road’      https://citrusrootstocks.org/   
   US-1284      0-10      5 F      C. reticulata ‘Ninkat’ × P. trifoliata ‘Gotha Road’      https://citrusrootstocks.org/rootstock-cultivars/, https://tropicalfruitforum.com/index.php?topic=43545.0   
   US-1516      30-40            C. grandis ‘African’ × P. trifoliata ‘Flying Dragon’      https://citrusrootstocks.org/   
   US-802      0-10            Citrus grandis ‘Siamese’ × P. trifoliata ‘Gotha Road’      https://citrusrootstocks.org/   
   US-812      10-20            C. reticulata ‘Sunki’ × P. trifoliata ‘Benecke’      https://citrusrootstocks.org/   
   US-852      40-70      5-10 F      Citrus reticulata ‘Changsha’ × P. trifoliata ‘English Large’      https://citrusrootstocks.org/rootstock-cultivars/   
   US-897      0-10      Less hardy than swingle      C. reticulata ‘Cleopatra’ × P. trifoliata ‘Flying Dragon'      https://citrusrootstocks.org/, https://tropicalfruitforum.com/index.php?topic=45140.0   
   US-942      0-10            C. reticulata ‘Sunki’ × P. trifoliata ‘Flying Dragon’      https://citrusrootstocks.org/   
   Ventura lemandarin      Low?      11 F            https://hardycitrus.blogspot.com   
   Volkamer lemon      2      Poor            https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Wheeny Grapefruit      100                     
   Wilking      100      20 F               
   x-639      10-20                  https://crec.ifas.ufl.edu/extension/citrus_rootstock/tables.html   
   Yuzu      Low      10-15 F            http://www.mckenzie-farms.com/photo.htm, http://citruspages.free.fr/classification.php#monotypes   
   Yuzuquat            7 - 10 F      Yuzu x Nagami kumquat      http://hardycitrus.blogspot.com/2014/01/cold-hardiness-table_13.html   

13
Cold Hardy Citrus / US-1279 and SuperSour 2, new and better zygotic parents for cold hardy breeding?
« on: May 15, 2023, 11:20:45 AM »
Browsing the literature, it seems the industry has started moving away from highly nucellar rootstocks, which is great news to those of us with breeding aspirations. Most of the new HLB resistant rootstocks have very high rates of zygotic seedlings, at least according to citrusrootstocks.org and the papers I found for the newer USDA releases.

While I haven't found specific cold hardiness data, just looking at perigee, two of the new ones, US-1279, Changsha x poncirus, and SuperSour 2, poncirus x (c. aurantium x c. ichangensis) ought to be very cold hardy. US-1279 is listed as 100% zygotic. Supersour 2 has not been determined yet, but one of the stated goals of the SuperSour program is to breed highly zygotic rootstocks, so it's likely this release will be very good for breeding as well.

And since these are USDA released rootstock plants, they should already have great disease residence, including some HLB resistance, vigor, and productivity. Assuming the hardiness is as good as it ought to be given their parents, I'm thinking these two might make great alternatives to the other poncirus and poncirus x varieties that are currently out there.

14
Temperate Fruit Buy, Sell, & Trade / WTB Chilean guava cuttings
« on: May 13, 2023, 11:12:53 AM »
Looking to buy some cuttings of Ugni molinea, the Chilean guava or guavaberry. If possible, not the variegated selection.

15
Tropical Fruit Discussion / Cashew fruit taste like sea buckthorn?
« on: April 26, 2023, 09:18:00 PM »
This will be a niche among niches, but here goes.

I had cashew fruit for the first time today. While I'm not a fan, it certainly tasted interesting. Took a while to work it out, but it was lightly tropical (vaguely passion fruit or lichee), with a kind of bruised to the point of mushy strawberry, and a weird funk that I guess is like the ends of a pineapple that's over ripe. The funk got stronger the more I had.

I couldn't really place it, or even describe it well. Then it hit me. Sea buckthorn???

It's been such a long time since I've had sea buckthorn though, so I'm not sure if my taste buds are hallucinating at this point. My question is, any of you guys and gals ever had both cashew fruit and sea buckthorn? Do they actually taste similar?

Alternatively, maybe I just had a bad one ("tastes like sea buckthorn" is not a complement to my mind...). For those who have had cashew fruit, is it good, or kinda funny in a not so nice way?

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