From what I remember, Tristan went to huge lengths to legally import Mexicola seed then grew them out and sold most of them. I had two of them but they're not old enough to fruit yet.
I have no idea if he imported more seed. If he did the seedlings will still be expensive and in limited supply. If not the supply will be super short until the young trees are old enough to bear fruit. Then the price ahould plummet as Europe becomes home to ever greater supplies of frost hardy avocado trees.
Two pictures of my outdoor avocado that has survived the last winter unprotected. It is a mexicola avocado. Thanks to Benoit for the seeds. It had a type of disease at the lower trunk that turned all black. I then put clay paste onto the afflicted area for one year with a bandage and now the wound seems clean. I am hoping that the bark will grow and close the wound. This is my best achievement yet at growing avocadoes outdoors cause the plant is still alive and growing. It has survived 2 or 3 winters outoors, i can't remember exactly.
I do have to say that the last couple of winters were quite mild, no doubt thanks to global warming, but most of its leaves look totally brown and wasted each spring. But it always grows back, for now.
If it continues to survive and grow maybe i will get some fruit in 10 years time. There is hope yet...
I'm not in Europe but in the cool coastal pacific northwest of California. I've got one 2 year old has that needs to be uppotted, one bacon that is a year old, and two fuerte avocados. The bacon and fuerte grew very well this year and I'm optimistic about their prospects
Should I up pot things over winter like I would with most perennials?