I haven’t seen any articles, or know of any attempts. I plan to try a couple of crosses when my plants are mature enough to flower and fruit. I only know if the ‘sweet Uvaia’ a cross between E Pyriformis and E lutescens. I also know that there are over 50 different varieties of Uvaia. And more even of E Uniflora. In any case I wonder how well different species of Eugenia will be able to cross pollinate each other. But I sure am going to give it a try!