I have a large jacaranda tree in my front yard (perhaps 30-50 yrs old). I recently pruned a few branches that were about 2" thick. You can see one fresh cut in the picture below and there are a few more in different places.
Now all of these are within an arm's reach and I was wondering if it would be possible to graft a scion from a fruit tree or another flowering tree onto each of these new stubs. Normally, grafting is done between "similar" plants. The wikipedia article on rootstock says:
The rootstock can be a different species from the scion, but must be closely related.
But how "close" is close enough? Same genus/family/order? It might be easy to find similar flowering trees to jacaranda, but is it possible at all to graft any fruit trees onto this?
I haven't set my mind on any particular fruit/flowering tree and this is more of an experiment rather than wanting to actually grow something for consumption (if it works, well and good!). If it matters, I'm in Southern California, so there really isn't any winter to speak of and temperatures hardly go below 8-10 ºC (46-50º F).