Posted: 20/03/2015 at 17:00
That is much bigger than most planters, I have roses in ones about 50cms deep. I think it might manage a dwarf apple tree. My daughter has an olive tree in a planter about that size. You will have to feed and water it though.
The other tree that could work is Mirabelle de Nancy on a semi dwarf stock, will grow to about 8 foot. I had one in a pot for 2 years before I planted it. I could have just potted it on, it was in a much smaller pot than yours. It is self fertile. Don't forget apple trees need to be near other apple trees of the right sort for fertilisation. Ask the supplier.