I would take it out of the pot and plant it where you want it to grow, put a little fence around it to protect it from being walked on or mowed down. That way the excess water would run out and it would get the natural rain. Lime about 18 inches around it and use some cow or horse manure in the fall. Don't plant it close to the house as the grow tall & mighty. Don't plant near pipes, drainfields, septic, cell pools, garages or walls. These mightly oaks grow tall & wide........I would not plant that within 100 ft of a home, barn or another structure.