What does an oak tree needs to survive?
If your oak is receiving summer water, gradually defrease the summer water util there is no more summer water, Lawn and drip irrigation are not good for oaks! If there are weeds growing under your oak tree, you will want to get rid of them fast, because weeds choke he life out of the oaks, but when you do get rid of the weeds, try not to disturb the soil too much. DO NOT fertiliize oak trees under any circumstances! Also, DO NOT spray fungicides or insecticides on oaks. There is a lot of good fungi on the oak that it needs to survive. DO NOT prune mature oad trees. Light pruning is ok, however, so you can walk under it, or so a limb is not in danger of falling on your house, car, or person. Remember that lots of birds best in cavities in dead branches.
