These are two unrelated topics except for they both relate to grafted apple trees.

First, this summer I noticed that a branch had fallen off of one of my multigraft trees.  It was one of my favorites - Pristine Apple,  a PRI disease-resistant cultivar with early, sprightly flavored apples.  I never took a good look until today.  I thought it broke off due to overbearing and lack of thinning.  What I saw today, was that the branch had grown to a decent size, without the heartwood ever fusing together.  It held together via the cambium and bark.  It diden't splinter and split, it just fell off.  This was on M106 rootstock.  I bought the tree from Raintree in 2014.  Also grafted to this rootstock are Queen Cox and Rubinette, and those graft unions continue to appear strong.

I also have a question for more experienced HOS Members.  I took the HOS Grafting class in 2013, and took home the Sutton Beauty that I grafted there.  It is now Sutton Beauty with additional grafts of Baldwin, Liberty, Airlie Redflesh, and Newtown Pippin  This tree is small - under 8 feet tall.  My question is, what is the rootstock?  I never wrote it down.  Does HOS use the same rootstock every year?  Is there a way to find out?

Thanks for any input..  I always enjoy reading this forum