fruit rootstock as inground starter material

[nuttiest]

I am wondering if anyone uses apple or peach/plum rootstock to grow out and use as nursery material. I have some apple varieties that supposedly flower here, but I figured more or different rootstocks to try with them would be great. Also wondering if you know of any a specific dwarfing rootstock that has smaller leaves (or reduces leaves noticabably).

 

[Shibui]

Dwarfing root stock do not always have smaller leaves. The root stock cultivars that I've used all have similar leaves to other apples. It's more often the roots that confer the dwarfness to the grafted tree and that's NOT going to do you any favours as a bonsai where we hope for good nebari and strong roots.

I am wondering if anyone uses apple or peach/plum rootstock to grow out and use as nursery material.

When you say nursery material I'm assuming you mean for bonsai? (rather than for grafting, etc)
Otherwise plum roots stocks are very similar to plums in general
Peaches here are grafted onto either 'golden queen' (a hardy canning peach so seed is readily available as a by-product) or 'green nemaguard' which is supposed to be more resistant to root diseases. Leaves on both those are same as any other peach or nectarine so I can't see any advantage in growing either of them over any other peach.
The plum stocks I've used are all very similar to the plum varieties that are grafted on top so, again, no real advantage (or disadvantage)