I have just one jacaranda. I keep trying to propagate it in different ways but haven't had any luck. The structures on the petiole of the compound leaf do look like root nodes, don't they? Do you know what I'm talking about?
They say it will never flower in a pot but I just say, challenge accepted!
Yup thats it.. send a pic. Mine are 2 years old should flower around 4 years I believe. Cheer$;)