Hello,
For some years now, I've been trying to acclimatize white sapote in France (Nîmes, zone 8b/9a). There are some very old specimens of Casimiroa edulis on the Riviera (the one at the Hanbury villa was planted 130 years ago). But these Casimiroa have not been as popular as in California, probably because Riviera gardeners have not made the effort to select fruit. In fact, these old trees produce almost nothing.
After watching Tom Addison's video on the subject, I realized that seedlings were often of poor quality: they produce mediocre fruit and the upright trees made them difficult to pick.
I try to get some Californian budwood. Do you know anyone who might be able to sell me some (Marta does not send to Europe)? I've found some varieties in Italy and Spain like Mc Dill, Suebelle and Vernon, but the characteristics of these trees (especially the fruits) don't seem to match those in the United States. I have the impression that nurserymen here provide us with what we're looking for without really making the effort to obtain the real varieties...
I'd like to know what you think of Florida varieties like Younghan's Gold and Campbell, do they do well in Mediterranean climates?
I'm also very interested in Casimiroa pringley, I have some 2-year-old seedlings. In Tom's conference, he mention the possibility of hybridizing this species with other Casimiroa. Does a Casimiroa hybridization program exist in the United States? From institutions or amateur gardeners?
In its video, Tom consider Casimiroa tetrameria as a fruit of inferior quality. However, on the tropical fruit forum, some people say that species can give very good fruit. I do not know what to think ?
There are other casimiroa species such as casimiroa sapota. Do you have any idea of the hardiness of this species and do you grow it in California for its fruit?
By the way, I seem to have successfully cut white sapote (Casimiroa edulis).

At the beginning of May, I cut some 15 cm cuttings with a good diameter (5 mm minimum). I put them in a pot, half-buried. No protection (no smothering cuttings), just shade. The above-ground part of the plant got off to a fast start, but due to lack of regular watering, it didn't grow much, but after three months, there were roots!
Here is a video of my Sapote :
https://www.youtube.com/watch?v=TZCuwEuzkXw
Hello, Just some questions/comments...
Firstly, don't forget that all grafted selections came from high quality seedlings. A little off topic, but I've heard that the hass avocado was just someone's backyard avocado seedling some time back, and it produced high quality fruit, and ended up being grafted and going commercial.
The point is, seedling can very well produce good fruit, that is equal to or surpasses the parent tree.
My other comment is that I have read Casimiroa Edulis and Casimiroa Tetramera are hybridized in the case of some white sapote cultivars.
My question is about where to buy rare Casimiroa. You mention Casimiroa Pringley and Casimiroa Sapota. Where did you buy them?
Cheers.