Tis the season for tropical eggplant relatives to ripen. Most years I only grow one species at a time in order to have clean seed since all of these will cross with each other. I've had better luck getting early fruiting by rooting cuttings in the fall, overwintering in the greenhouse and planting out the following May or whenever night time lows get above 50 degrees F, so this year I went ahead and let some of them fruit. I've heard that Cocona crossed with Lulo makes a superior juice so I may attempt that cross next year. This year has been very hot and extremely dry so I'm surprised I got anything off of them. I'm in zone 7b (Raleigh NC)
Naranjilla Solanum quitoense
Lulo Solanum quitoense 'Lulo' (scientific name is in dispute) I treat it is as an improved cultivar since the fruit is so much bigger
here's a shot showing both fruit side by side
Cocona Solanum sessiliflorum just starting to flower. these are seedlings I plan on planting in the ground next spring.