My crop came in a little late this year, possibly due to a cool Spring and mild summer. Plants were grown from cuttings taken during last years harvest. They grow like any eggplant except that Lulo does not like hot weather. Seed grown plants take more than one year to get to blooming size for me (zone 7). It sounds harmful but I have no problems just digging them up in the fall and planting them in pots that I shelter in my greenhouse. I trim off some of the leaves and any branches without fruit and they never show a sign of distress.
Taxonomists can argue over who belongs to which species and whether Lulo belongs somewhere other than Solanum quitoense. They look alike, and my photo may not show the difference but in my plants, the Lulo has more purple on the leaves and then leaves tend to get bigger. Cocona handles hot weather just fine and can be planted out in full sunshine. Lulo has to be in more shade and sulks when the days get over 85 degrees.
I usually wait until the tiny hairs on the fruit brush off easily to consider them ripe, but I believe they are tasty even before then. Coconas are very sour but take on tropical fruit tones when cooked with sugar and a touch of lemon juice. Lulos taste more like tangerine to me and usually gets mixed with orange juice as a breakfast drink. I used to also grow standard Narajilla but once I got ahold of true Lulo seed I didn't see the point. If I run out of room in the greenhouse then I simply cut the branches off with fruit and lay them on a table out of the way (branches and leaves are covered with spines), the fruit eventually ripen and don't taste much different than those allowed to ripen on the plant.
Cocona on the left, Lulo on the right
Cocona fruit
Lulo fruit