I have a minarette apple with two varieties on planted in a half barrel. It produced brilliantly the first couple of years but less well last year so I will repot it before spring, back into the half barrel but with fresh soil.
I keep it well pruned and give it far more water than you would think - I empty the bowl I have scrubbed the tatties in onto it most days except in winter. That gives it some nutrients as well as water as the tattie plot soil is very well manured and there is always some to wash off.
It produces lots of rosy red apples (I think the bottom variety is Falstaff) which my many grandchildren find irresistable

so not many get the chance to ripen fully

The tree plus barrel is now so tall that I can only just reach the top apples but it won't grow much taller than that.