This is an interesting topic lol. There's been a few trees where I just completely gave up on.
Around 20 years ago I got 2 longan airlayer varieties from Florida at a time where usually u could only find Kohala here. It was Sri Champoo and Edaw. It was directly from the man that first brought it from Thailand and introduce it to Florida. For the life of me, I can't remember his name but if anyone knows, let me know. In all, that time I was never able to get a single ripe fruit from them, blooms profusely, but barely held fruit and when it did the fruit never quite ripen. To this day, I still don't know why as I hear other had successes in California. Well I topworked both trees about 4 years ago. I get fruit from those top work now, ahah.
Another was ilama. Maybe 15 years ago i obtained some seeds. Babied the few seedlings that I got. Got 1 to live. Grafted that seedling branch onto my cherimoya. Took a few years but it flower. It was a pain to pollinate as it didn't accept any other Anona pollens. When I did get fruit, it tasted like a sweet potato to me. But kept waiting for it to get better or maybe I thought I did something wrong. Gave up on it a couple years ago and topworked the branch. I just leave it at just bad luck and poor variety ahah.
