Hello, I dont have any tips regarding your question, but just wanted to ask if your jaboticaba trees were bought from an italian nursery, and if you could provide the name of the nursery that would be great. Thanks
As for your question, I have not done this with such plants but from my 2cents standpoint, I think u should do this when its cooler and provide some kind of shade for them in the first few weeks , and water them on a regular basis.
I think u could transplant them anytime,since your putting them in a greenhouse, but I would pick a cooler time of the year and possibly in early spring before the growing season starts. Thats from a personal experience , thought with deciduous plants.