Sorry to hear about the failure and there’s little that can be done right now without dormant scion wood. ‘Stone fruit,’ which includes cherries, are tuff candidates for dormant grafting, sorry to say. They’ve a bit better ‘take’ when ‘bench grafted’ to small rootstock (as yours were) than ‘topworked’ onto an exiting (larger) tree. Most stone fruit are budded in nursery rows, in August. In fact, most fruit trees are budded, as opposed to ‘what we do’ at the Propagation Fair (Scion Exchange).

That said, below is likely your next best opportunity to salvage the rootstock and come up with the varieties you want – and - it’s free! You’d pot up your rootstock and bring them to the budding workshop; you’d get a bud-stick from one of the cherry varieties at the Arboretum; then learn to bud or have it done – adding a bud to your cherry rootstock/s, likely below any new growth.

The bud doesn’t put on a lot of growth, occasionally you’ll get no growth at all, but if it takes – you’ll know, and it will be set of grow next spring. Just pot them for now and let them ‘grow.’ That will beef up their root system and keep the trees (alive) healthy until budding. I wouldn’t suggest going back for another bench graft next March …though we’d (I’d insist we) do it for free…

Here you go: Budding Workshop
"Saturday, August 6, 2011 - 9:00 AM at the HOS ArboretumClass starts at 9:00 AM, there is no charge. Following the class will be a summer pruning demonstration, fruit tasting and ending with our annual summer potluck."