If the trees are 25 miles away you probably won't water them enough through the inevitable drought we always have. To fix that problem, I highly recommend this stuff around the roots when you plant.http://www.moisturemizer.com/
I've planted several big bunches of trees and then walked away with no watering beyond the 1st couple weekends. The vast majority of them died until I found out about this Moisture Mizer stuff. You just mix about a tablespoon full of it with the dirt around the roots of each tree and it absorbs an enormous amount of water and holds it between rains for the tree to use.
I havne't lost hardly any trees at all since using it.