I wonder if we had any Paw Paw scions at the Exchange..? I stopped short of planting Paw Paw's due to the heat they apparently need to ripen fully (at my place), and the fact you need both a male and female tree...
I'd doubt very much if you could locate any 'still dormant' scion wood ... most Paw Paw trees are pretty far from here... Have you ever looked over Craig's List
--- Look in the "Discussion Forums
" and click on Garden
. I've led some of 'them' here, and the discussion's seem to span the nation! There's a lot of info coming up from the Bay Area; it's a blast to read about stuff far too exotic
for us up here... Post your question there!
If you can get some 'Fresh' bud wood later this summer, and your tree's not too old (with bark too thick to Bud) - and of course - a variety you'd want, that might work...? If not, at least get the word out so as to procure some scion wood for next year.
As far as cleft, or 'splice' grafting right now ... from my experience, the tree should
be dormant, and I'm sure the sap's flowing by now... If your bark is 'thick' - and you can locate some dormant wood - a bark graft might be your best bet..? Don't know how I missed your question here, maybe the "Asimina Triloba" threw me! And believe me - I'm not trying to answer everything!! ... just trying to help