Hey there, thanks for sharing these reports! It was very interesting! Many growers dont seem to be patient... for instance, for Ubajay: it can be the WORST fruit in the world if you have a bad variety or if it is not really ripe! But when it is ok, it is my favourite Eugenia with no doubt!
So here’s the lowdown on these Eugenia aff. arvensis fruits (E. subterminalis in fact): Maybe when grown from seed they can be a bit hit-or-miss flavor-wise because of natural genetic variation. If one fruit ends up tasting off, it might just be that natural variability or maybe it wasn’t fully ripe or the plant needs better soil/sun.
It happens the same with E. involucrata, uniflora and other ones... I even have an uniflora that tasted very bad in the first fruiting season, so I was goint to remove it... but by the next year it was pretty good! So: PATIENCE. Be wise!
A good trick is to let the fruits continue ripening after harvest—try putting them in a paper bag at room temperature to help boost their natural ethylene and let them soften up. That usually brings out the best flavors. Or maybe the tree is needing more sun? Or maybe by the next season will be better, and better (it happens here with Ubajay, Involucrata, Uniflora and others).
Also, my current supplier mentioned that these fruits are actually favored over pitanga (Eugenia uniflora) by him in terms of taste, so they really shouldn’t be bad overall.
Hope that helps clear things up! Let me know if you have any other questions.