The Tropical Fruit Forum

Hershell Boyd says that UGA Pink Frost Grapefruit is from a tree growing well in a yard in South Georgia.  There is nothing extra special about it.

Duck Duck Go on Firefox hallucinated the following when I searched for "Roy Pomelo"

My mother's new 45 years old Grapefruit (hybrid?) tree
Jan 4, 2025My seedling pomelo tree took 7 yrs and now I get nice big pomelo fruits of "Roy" pomelo each year, and the taste dramatically improved. I transplanted my neighbor's 45yr old Meyer lemon tree that had 1200 fruits when I dug it up, it has been a year now, and the tree is showing signs of new

A researcher from University of Florida said that tetraploid citrus would be more sensitive to drought conditions.  The larger xylem cells would be more likely to get air in them and be permanently unable to transport water to the leaves.  Standard citrus seems to be susceptible to this problem when first getting established. 
Some crops such as strawberries have higher chromosome numbers.  Crossing tetraploid citrus with each other could increase the possibilities for new and improved qualities.  The breeding of tetraploid daylilies has introduced never before seen flower colors and shapes.  Perhaps that could happen with citrus, including more hardiness. 

My unprotected Keraji high grafted onto poncirus barely survived approximately -13 C. 

Mikkel: This may be linked to auxin formation in the apical meristem and in the uppermost leaves. Auxins promote callus formation. It might be possible that the presence of an auxin source favors attachment success...

Good idea.
Maybe sugars trying to get to the root stimulates the connection? 

Lauta_hibrid: I usually leave a leaf from the graft root inside the bag with the mini graft (which also has leaves). This leaf from the root usually accumulates moisture when it transpires inside, and helps the graft leaves stay hydrated.

I am going to encase the entire plant in a clear plastic bag, leaves not covered with parafilm do dry out. 

The fruit in your pictures appears to have more pulp than is usual for poncirus.  Perhaps it isn't the pure species.

Keeping them in the shade and out of the wind should be enough, even down to 0.

In the second picture it looks like the plant is a tetraploid.

UF/IFAS has developed a few varieties that are recommended for the home landscape. These include:

Sugar Belle®- a rich-flavored, delicious mandarin with first harvest in mid-November to late December; HLB-tolerant

Marathon mandarin -- fruit matures early and is attractive; peels fairly easily; seedless, not messy and great flavor; HLB-tolerant

There is also a tree that was discovered in an orchard without symptoms and is being propagated with great excitement, don't know the name and an internet search is not yielding results.

Dig a hole next to a plant to check for soil moisture.  You don't know if there is too much or too little moisture unless you look.  Chicken manure is extremely high in nitrogen and can easily burn your tree.  Something like Osmocote plus is a better choice as it releases fertilizer slowly.  Protect your plants from full sun until they are larger. 

The AI program Perplexity provided this:
Yes, there are a few olive tree varieties that can potentially thrive in USDA Zone 7, though they will require some extra care and protection during cold winters. Based on the search results: The Mission olive tree is considered one of the hardiest, able to tolerate temperatures down to around 20°F (-7°C). As one of the oldest American olive varieties developed in California, it is well-suited for the west coast climate including Zone 7. The Frantoio olive tree from Italy is rated as very cold-hardy, tolerating temperatures down to around 10°F (-12°C). It is recommended for growing in the Pacific Northwest which includes parts of Zone 7. The Arroniz olive variety from Spain has a very high cold tolerance rating of 5 out of 5, potentially able to withstand temperatures below 0°F (-18°C). This makes it a good candidate for Zone 7 climates. The Chemlali olive tree from Tunisia is described as more cold hardy than most, tolerating Zone 7 temperatures. Its compact size also makes it suitable for smaller yards. While not ideal, the Arbequina olive can sometimes survive in Zone 7 if given extra protection like planting near a warm south or west-facing wall. But it may suffer damage in extremely cold winters. So in summary, while olive trees prefer warmer climates, with proper varietal selection like Mission, Frantoio, Arroniz or Chemlali, and by providing warm microclimate conditions, it is possible to grow olives in the cooler Zone 7 regions.

The actual answers have links to the provided information

I thought the flavor was as good as store bought fruit.  The problem is getting the tree to produce fruit.  I am still struggling to get one fruit.  An advantage of growing citrus outside of the usual areas is that you will not need pesticides.  An Owari grown outside of the citrus zone has blemish free fruit without pesticides. 



Virginia Fruit Grower on his channel discussed the problem of lack of fruit with Stan.

Meiwa did not fare well in a coastal South Carolina trial.  It is probably less hardy than other kumquats.