It's not really micro I just grow my dwarf fruit trees in containers. I have grown apples and japanese persimmons in pots for a few years now. I also have peaches, plums, pomegranate, muscadine and pears in very large containers. I now have blooms on my pomegranate and fruits on my apple, pear and peach.
My Micro Orchard
What do you use for soil in the pot, and how do you keep it from getting "tired out"? One of the problems I have had with plants in pots is that the soil doesn't last as long as the plant.
I use garden soil and I do go to a larger pot every 4 to 5 years.