Here are some pics of my Psidium australe plants and fruits.
Plant is a very low bush, and fruits are like small guavas.... green for now, not really sure the final colour they will get when properly ripe.
I can confirm this species is very cold hardy (to 9a climate at least) as I left some plants outside last winters and they were all fine.... it's origins being South Brazil this was sort of expected and not really a big surprise.
Only problem I can report now is that these fruits seem to take forever to ripen, so to those friends I promised seeds earlier in the year I just ask to please be a little more patient... I'm not sure if these fruits will continue to ripen now that we are going towards winter here, or if they will only ripen by next spring... I will try to report my conclusions latter.
In reality my plants have already fruited on previous years but frankly I did not gave it any attention and the fruits eventually disappeared, probably taken by wildlife... this is the first year I am trying to monitor these fruits... Let's wait and see what happens
Here are the photos: