The larger container provides ample soil, which minimizes the shock from transplanting. Water when the surface of the soil feels dry to the touch. Continue watering the tree until the entire root ball is moist. Don t water again until the soil surface feels dry again. The lack of all moisture is unhealthy for any tree even junipers and pines that prefer their soil on the dry side.
Moist soil is friable and feels cool to the touch.
A moist soil is the safest and most desired condition for most plants. After moist a soil becomes wet which can be tolerated by few trees. If your soil is always wet, check for poor pot drainage, non functioning roots, and review your soil formulation.