Thank you Hanazono, I was hoping for your expertise. I have buried the hylo in pumice but I have not removed the green tissue. There isn't much green tissue anyway, it's a very small piece, about 20mm.
Should I have cut off the flesh and left the vascular bundle? What is the risk of rot to the scion of i bury the stock?
I don't have access to scoria, but I do have access to different grades of pumice, zeolite, and spongolite. In your guides to degrafting, you mention a top layer of scoria. Would pumice be appropriate substitution? What grade for this top layer for the scion to eventually root into?