Today I planted an apple tree grown on dwarfing rootstock (M27). The soil at my allotment is very heavy yellow clay. But it's on a decent slope.
I dug a hole the depth of the container in which it came. The bottom of the hole was practically hard clay, you could make sculpture out of it. Therefore I did the following:
Put in some big stones. Then compost, fish blood and bone and horticultural grit, all mixed together. Planted the tree and the stake.
I fear that the tree roots might get stuck in the clay "ball", and that the drainage might not be as good as needed.
Can someone give me any impressions about this, and in case it seems it's doomed to root rot, is there anything I could do to prevent it at this stage?
Below you see a picture, and I am in Bristol, UK.