I've had some questions from readers about the origins of my friend Daniel's mystery fruit tree and after further research, the questions have multiplied and there are few answers in sight.
My friend Bharati asked if the tree has two fruiting seasons. Daniel says no. The tree has one fruiting per year. It blooms in March and the fruit is ready in November. I think Daniel was careful not to say that the fruit "ripens" because as I've discussed in a previous post, the most notable characteristic of the fruit is that it NEVER seems to ripen.
Daniel believes that the mystery tree is "definitely a stone fruit in genus Prunus." He suspects that one of the wild almond trees in his Mount Washington neighborhood was cross-pollinated with some kind of cultivated stone-fruit tree like a peach. (The tree was a "volunteer" that sprouted in his yard a number of years ago, so he has no clue about it's actual origin.)
Daniel has previously said he thought the tree was a Sliva. Since the word "Sliva" is Bulgarian for plum, I suppose it's not inaccurate to call the mystery fruit tree a "Sliva", but at this point, we're all curious to know more.
Bharati also asked if I had a photograph of a cross-section of the fruit. I've checked the photo archives and I'm sorry to report that I do not. I did, however, have this closer view of the fruit itself.