The majority of these stems grew, and I’ve given away a few, but as I’ve been busy with other things they are taller than I am. I’m actually planning to use them to replicate/replace the rodent-chewed interstems from the project that started this experiment, as noted here: Waiting for the blizzard, thinking about apple interstems (ME coast, 5b).
The rootstocks are at least as big as my thumb, so I probably need to cleft graft the interstems into them. Then for varieties, @hollygates kindly sent me a box of interesting scions from his beautiful backyard wall.
I was pretty happy with the results of the interstem experiment until I lost half the trees to varmints several years in; in the future I might just plant on 111 or a slightly smaller rootstock and wait longer…