Part of the Winter collection
Fruit Tree Grafting: Winter Field Notes
Field note
someone else noticed you can graft toka (prunus simonii hybrid)
someone else noticed you can graft toka (prunus simonii hybrid) to chokecherry… in 1887 in this update from the michigan horticultural society. google books search https://www.google.ca/books/edition/Annual_Report_of_the_Secretary_of_the_St/wHU5AQAAMAAJ?hl=en&gbpv=1&dq=prunus+virginiana+grafted&pg=PA100&printsec=frontcover