Q.dwarf stoned fruit tree in pots in greenhouse.
I have a 8×6 greenhouse, am tired of growing tomatoes. New challenge is wanting to grow melons and dwarf cherry- plum- fig-apricots in pots down to soil level, is that viable. Thank you. J M Garrood.

Certified GKH Gardening Expert
Yes, This can be an option. This is called Pot-in-pot production.
You will implant an equal size container with good drainage in the soil as the one that the tree is in. Then just plant the other container directly into this.
This set up will allow you to move the trees into different locations as needed without disturbing the roots.
I found a website that will help explain things a bit further: http://www.uky.edu/ccd/production/system-resources/nursery/pot-in-pot