Will these plants be exposed to this coming winter's outdoor temperatures?
I'm not sure yet. I'd prefer to graft them on trifoliate, or a trifoliate hybrid, before putting planting them outside, and so far I don't really have any trifoliate hybrids big enough to graft onto, and I would probably want to grow the graft on to the rootstock inside to ensure it takes, which could take even more time before it goes outside.
It might survive on its own roots, if I just planted it outside right now, but from my experience with this last Winter, I am reluctant to take any chances.
I'm confident it would survive, I'm just concerned it might be killed back and be a third of its size, which would be a big setback. I'd like to try planting it out on trifoliate. However, they are rapidly outgrowing their containers, and it's difficult for me to have many large containers growing inside.